''Amaranthus'' is a

cosmopolitan Cosmopolitan may refer to: Internationalism * World citizen, one who eschews traditional geopolitical divisions derived from national citizenship * Cosmopolitanism, the idea that all of humanity belongs to a single moral community * Cosmopolitan ...

group of more than 50 species which make up the

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of annual or short-lived

perennial plant In horticulture, the term perennial (''wikt:per-#Prefix, per-'' + ''wikt:-ennial#Suffix, -ennial'', "through the year") is used to differentiate a plant from shorter-lived annual plant, annuals and biennial plant, biennials. It has thus been d ...

s collectively known as amaranths. Some names include " prostrate pigweed" and " love lies bleeding". Some amaranth species are cultivated as

leaf vegetable Leaf vegetables, also called leafy greens, vegetable greens, or simply greens, are plant leaves eaten as a vegetable, sometimes accompanied by their petioles and shoots, if tender. Leaf vegetables eaten raw in a salad can be called salad gre ...

pseudocereal A pseudocereal or pseudograin is one of any non-grasses that are used in much the same way as cereals (true cereals are grasses). Pseudocereals can be further distinguished from other non-cereal staple crops (such as potatoes) by their being pr ...

s, and

ornamental plant Ornamental plants or ''garden plants'' are plants that are primarily grown for their beauty but also for qualities such as scent or how they shape physical space. Many flowering plants and garden varieties tend to be specially bred cultivars th ...

Catkin A catkin or ament is a slim, cylindrical flower cluster (a spike), with inconspicuous or no petals, usually wind- pollinated ( anemophilous) but sometimes insect-pollinated (as in '' Salix''). It contains many, usually unisexual flowers, arra ...

-like cymes of densely-packed

flowers Flowers, also known as blooms and blossoms, are the reproductive structures of flowering plants ( angiosperms). Typically, they are structured in four circular levels, called whorls, around the end of a stalk. These whorls include: calyx, m ...

grow in summer or fall. Amaranth varies in flower, leaf, and stem color with a range of striking

pigments A pigment is a powder used to add or alter color or change visual appearance. Pigments are completely or nearly solubility, insoluble and reactivity (chemistry), chemically unreactive in water or another medium; in contrast, dyes are colored sub ...

from the spectrum of maroon to crimson and can grow longitudinally from tall with a cylindrical,

succulent In botany, succulent plants, also known as succulents, are plants with parts that are thickened, fleshy, and engorged, usually to retain water in arid climates or soil conditions. The word ''succulent'' comes from the Latin word ''sucus'', meani ...

, fibrous stem that is hollow with grooves and

bract In botany, a bract is a modified or specialized leaf, associated with a reproductive structure such as a flower, inflorescence axis or cone scale. Bracts are usually different from foliage leaves in size, color, shape or texture. They also lo ...

eoles when mature. There are approximately 75 species in the genus, 10 of which are

dioecious Dioecy ( ; ; adj. dioecious, ) is a characteristic of certain species that have distinct unisexual individuals, each producing either male or female gametes, either directly (in animals) or indirectly (in seed plants). Dioecious reproduction is ...

and native to North America, and the remaining 65 are

monoecious Monoecy (; adj. monoecious ) is a sexual system in seed plants where separate male and female cones or flowers are present on the same plant. It is a monomorphic sexual system comparable with gynomonoecy, andromonoecy and trimonoecy, and contras ...

species that are

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

to every continent (except Antarctica) from tropical lowlands to the Himalayas. Members of this genus share many characteristics and uses with members of the closely related genus ''

Celosia ''Celosia'' ( ) is a small genus of edible and ornamental plants in the amaranth family, Amaranthaceae. Its species are commonly known as woolflowers, or, if the flower heads are crested by fasciation, cockscombs. The plants are well known in E ...

''.

Amaranth grain Species belonging to the genus ''Amaranthus'' have been cultivated for their grains for 8,000 years. Amaranth plants are classified as pseudocereals that are grown for their edible starchy seeds, but they are not in the same Family (biology), bo ...

is collected from the genus. The leaves of some species are also eaten.

Names and etymology

''Amaranthus'' comes from the name of this plant in

Ancient Greek Ancient Greek (, ; ) includes the forms of the Greek language used in ancient Greece and the classical antiquity, ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Greek ...

, , "amaranth, immortal", noun formed from the privative prefix , "without", and the verb , "to consume, to exhaust". Indeed, the amaranth has a reputation for not withering, with in particular its calice which remains persistent, and for this reason, represents a symbol of

immortality Immortality is the concept of eternal life. Some species possess "biological immortality" due to an apparent lack of the Hayflick limit. From at least the time of the Ancient Mesopotamian religion, ancient Mesopotamians, there has been a con ...

. Some species are used in dry bouquets. The form (with H), comes from an erroneous association with the Greek etymon (lat. ) meaning , found in the name of many plants (agapanthus, for example). Its denominations in the languages of the peoples cultivating it since ancient times in

America The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

are in

Nahuatl Nahuatl ( ; ), Aztec, or Mexicano is a language or, by some definitions, a group of languages of the Uto-Aztecan language family. Varieties of Nahuatl are spoken by about Nahuas, most of whom live mainly in Central Mexico and have smaller popul ...

, , in Quechua, or in

Maya Maya may refer to: Ethnic groups * Maya peoples, of southern Mexico and northern Central America ** Maya civilization, the historical civilization of the Maya peoples ** Mayan languages, the languages of the Maya peoples * Maya (East Africa), a p ...

, ''ahparie'' in Purépecha, in Huichol, and ''guegui'' in Tarahumara.

Description

Amaranth is a

herbaceous plant Herbaceous plants are vascular plants that have no persistent woody stems above ground. This broad category of plants includes many perennials, and nearly all annuals and biennials. Definitions of "herb" and "herbaceous" The fourth edition o ...

shrub A shrub or bush is a small to medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees by their multiple ...

that is either annual or

perennial In horticulture, the term perennial ('' per-'' + '' -ennial'', "through the year") is used to differentiate a plant from shorter-lived annuals and biennials. It has thus been defined as a plant that lives more than 2 years. The term is also ...

across the genus. Flowers vary interspecifically from the presence of 3 or 5

tepal A tepal is one of the outer parts of a flower (collectively the perianth). The term is used when these parts cannot easily be classified as either sepals or petals. This may be because the parts of the perianth are undifferentiated (i.e. of very ...

s and

stamen The stamen (: stamina or stamens) is a part consisting of the male reproductive organs of a flower. Collectively, the stamens form the androecium., p. 10 Morphology and terminology A stamen typically consists of a stalk called the filament ...

s, whereas a 7- porate pollen grain structure remains consistent across the family. Species across the genus contain concentric rings of

vascular bundle A vascular bundle is a part of the transport system in vascular plants. The transport itself happens in the stem, which exists in two forms: xylem and phloem. Both these tissues are present in a vascular bundle, which in addition will incl ...

s, and fix carbon efficiently with a C4 photosynthetic pathway. Leaves are approximately and of oval or elliptical shape that are either opposite or alternate across species, although most leaves are whole and simple with entire margins. Amaranth has a primary root with deeper spreading secondary fibrous root structures.

Inflorescence In botany, an inflorescence is a group or cluster of flowers arranged on a plant's Plant stem, stem that is composed of a main branch or a system of branches. An inflorescence is categorized on the basis of the arrangement of flowers on a mai ...

s are in the form a large

panicle In botany, a panicle is a much-branched inflorescence. (softcover ). Some authors distinguish it from a compound spike inflorescence, by requiring that the flowers (and fruit) be pedicellate (having a single stem per flower). The branches of a p ...

that varies from terminal to axial, color, and sex. The tassel of fluorescence is either erect or bent and varies in width and length between species. Flowers are radially symmetric and either bisexual or unisexual with very small, bristly

perianth The perianth (perigonium, perigon or perigone in monocots) is the non-reproductive part of the flower. It is a structure that forms an envelope surrounding the sexual organs, consisting of the calyx (sepals) and the corolla (petals) or tepal ...

and pointy

s. Species in this genus are either monecious (e.g. '' A. hybridus,'') or

(e.g. '' A. palmeri''). Fruits are in the form of capsules referred to as a '' unilocular pixdio'' that opens at maturity. The top ( operculum) of the unilocular pixdio releases the urn that contains the seed. Seeds are circular form from 1 to 1.5 millimeters in diameter and range in color with a shiny, smooth seed coat. The panicle is harvested 200 days after cultivation with approximately 1,000 to 3,000 seeds harvested per gram.

Chemistry

Amaranth grain contains

phytochemical Phytochemicals are naturally-occurring chemicals present in or extracted from plants. Some phytochemicals are nutrients for the plant, while others are metabolites produced to enhance plant survivability and reproduction. The fields of ext ...

s that are not defined as nutrients and may be antinutrient factors, such as

polyphenol Polyphenols () are a large family of naturally occurring phenols. They are abundant in plants and structurally diverse. Polyphenols include phenolic acids, flavonoids, tannic acid, and ellagitannin, some of which have been used historically as ...

saponin Saponins (Latin ''sapon'', 'soap' + ''-in'', 'one of') are bitter-tasting, usually toxic plant-derived secondary metabolites. They are organic chemicals that become foamy when agitated in water and have high molecular weight. They are present ...

tannin Tannins (or tannoids) are a class of astringent, polyphenolic biomolecules that bind to and Precipitation (chemistry), precipitate proteins and various other organic compounds including amino acids and alkaloids. The term ''tannin'' is widel ...

s, and

oxalate Oxalate (systematic IUPAC name: ethanedioate) is an anion with the chemical formula . This dianion is colorless. It occurs naturally, including in some foods. It forms a variety of salts, for example sodium oxalate (), and several esters such as ...

s. These compounds are reduced in content and antinutrient effect by cooking.

Taxonomy

''Amaranthus'' shows a wide variety of morphological diversity among and even within certain species. ''Amaranthus'' is part of the Amaranthaceae that is part of the larger grouping of the Carophyllales. Although the family (

Amaranthaceae Amaranthaceae ( ) is a family of flowering plants commonly known as the amaranth family, in reference to its type genus '' Amaranthus''. It includes the former goosefoot family Chenopodiaceae and contains about 165 genera and 2,040 species, maki ...

) is distinctive, the

has few distinguishing characters among the 75 species present across six continents. This complicates

taxonomy image:Hierarchical clustering diagram.png, 280px, Generalized scheme of taxonomy Taxonomy is a practice and science concerned with classification or categorization. Typically, there are two parts to it: the development of an underlying scheme o ...

and ''Amaranthus'' has generally been considered among systematists as a "difficult" genus and to hybridize often. In 1955, Sauer classified the genus into two subgenera, differentiating only between monoecious and dioecious species: ''Acnida'' (L.) Aellen ex K.R. Robertson and ''Amaranthus''. Although this classification was widely accepted, further infrageneric classification was (and still is) needed to differentiate this widely diverse group. Mosyakin and Robertson 1996 later divided into three subgenera: Acnida, Amaranthus, and Albersia. The support for the addition of the subdivision Albersia because of its

indehiscent Dehiscence is the splitting of a mature plant structure along a built-in line of weakness to release its contents. This is common among fruits, anthers and sporangia. Sometimes this involves the complete detachment of a part. Structures that ...

fruits coupled with three elliptic to linear

s to be exclusive characters to members of this subgenus. The classification of these groups are further supported with a combination of floral characters, reproductive strategies, geographic distribution, and molecular evidence. The phylogenies of ''Amaranthus'' using maximum parsimony and Bayesian analysis of nuclear and

chloroplast A chloroplast () is a type of membrane-bound organelle, organelle known as a plastid that conducts photosynthesis mostly in plant cell, plant and algae, algal cells. Chloroplasts have a high concentration of chlorophyll pigments which captur ...

gene In biology, the word gene has two meanings. The Mendelian gene is a basic unit of heredity. The molecular gene is a sequence of nucleotides in DNA that is transcribed to produce a functional RNA. There are two types of molecular genes: protei ...

s suggest five groups within the genus: . ''Amaranthus'' includes three recognised subgenera and 75 species, although species numbers are questionable due to hybridisation and species concepts. Infrageneric classification focuses on inflorescence, flower characters and whether a species is monoecious/dioecious, as in the Sauer (1955) suggested classification. Bracteole morphology present on the stem is used for taxonomic classification of Amaranth. Wild species have longer bracteoles compared to cultivated species. A modified infrageneric classification of ''Amaranthus'' includes three subgenera: '' Acnida'', ''Amaranthus'', and ''Albersia'', with the taxonomy further differentiated by sections within each of the subgenera. There is near certainty that '' A. hypochondriacus'' is the common ancestor to the cultivated grain species, however the later series of domestication to follow remains unclear. There has been opposing hypotheses of a single as opposed to multiple domestication events of the three grain species. There is evidence of phylogenetic and geographical support for clear groupings that indicate separate domestication events in South America and Central America. '' A. hybridus'' may derive from South America, whereas '' A. caudatus'', ''A. hypochondriacus'', and '' A. quentiensis'' are native to Central and North America.

Species

Species include: * '' Amaranthus acanthochiton'' – greenstripe * ''Amaranthus acutilobus'' – a synonym of '' Amaranthus viridis'' * '' Amaranthus albus'' – white pigweed, tumble pigweed * '' Amaranthus anderssonii'' * '' Amaranthus arenicola'' – sandhill amaranth * '' Amaranthus australis'' – southern amaranth * '' Amaranthus bigelovii'' – Bigelow's amaranth * '' Amaranthus blitoides'' – mat amaranth, prostrate amaranth, prostrate pigweed * '' Amaranthus blitum'' – purple amaranth * ''

Amaranthus brownii ''Amaranthus brownii'' was an Annual plant, annual herbaceous plant, herb in the family Amaranthaceae. The plant was found only on the small island of Nihoa in the Northwestern Hawaiian Islands, growing on rocky outcrops at altitudes of . It was ...

'' – Brown's amaranth * '' Amaranthus californicus'' – California amaranth, California pigweed * '' Amaranthus cannabinus'' – tidal-marsh amaranth * '' Amaranthus caudatus'' – love-lies-bleeding, pendant amaranth, tassel flower, ''quilete'' * '' Amaranthus chihuahuensis'' – Chihuahuan amaranth * '' Amaranthus crassipes'' – spreading amaranth * '' Amaranthus crispus'' – crispleaf amaranth * '' Amaranthus cruentus'' – purple amaranth, red amaranth, Mexican grain amaranth * '' Amaranthus deflexus'' – large-fruit amaranth * '' Amaranthus dubius'' – spleen amaranth, ''khada sag'' * '' Amaranthus fimbriatus'' – fringed amaranth, fringed pigweed * '' Amaranthus floridanus'' – Florida amaranth * '' Amaranthus furcatus'' * '' Amaranthus graecizans'' * '' Amaranthus grandiflorus'' * '' Amaranthus greggii'' – Gregg's amaranth * '' Amaranthus hybridus'' – smooth amaranth, smooth pigweed, red amaranth * ''

Amaranthus hypochondriacus ''Amaranthus hypochondriacus'' is an ornamental plant commonly known as Prince-of-Wales feather or prince's-feather. Originally endemic to Mexico, it is called ''quelite, bledo'' and ''quintonil'' in Spanish. In Africa and El Salvador, like many ...

'' – Prince-of-Wales feather, prince's feather * '' Amaranthus interruptus'' – Australian amaranth * '' Amaranthus minimus'' * '' Amaranthus mitchellii'' * '' Amaranthus muricatus'' – African amaranth * '' Amaranthus obcordatus'' – Trans-Pecos amaranth * '' Amaranthus palmeri'' – Palmer's amaranth, Palmer pigweed, careless weed * '' Amaranthus polygonoides'' – tropical amaranth * '' Amaranthus powellii'' – green amaranth, Powell amaranth, Powell pigweed * '' Amaranthus pringlei'' – Pringle's amaranth * '' Amaranthus pumilus'' – seaside amaranth * '' Amaranthus quitensis'' - Mucronate Amaranth * ''

Amaranthus retroflexus ''Amaranthus retroflexus'' is a species of flowering plant in the family Amaranthaceae with several common names, including red-root amaranth, redroot pigweed, red-rooted pigweed, common amaranth, pigweed amaranth, and common tumbleweed. Outside ...

'' – red-root amaranth, redroot pigweed, common amaranth * '' Amaranthus saradhiana'' - purpal stem amaranth, green leaf amaranth * ''Amaranthus scleranthoides'' – variously '' Amaranthus sclerantoides'' * '' Amaranthus scleropoides'' – bone-bract amaranth * '' Amaranthus spinosus'' – spiny amaranth, prickly amaranth, thorny amaranth * '' Amaranthus standleyanus'' * '' Amaranthus thunbergii'' – Thunberg's amaranth * '' Amaranthus torreyi'' – Torrey's amaranth * '' Amaranthus tricolor'' – Joseph's-coat * '' Amaranthus tuberculatus'' – rough-fruit amaranth, tall waterhemp * '' Amaranthus viridis'' – slender amaranth, green amaranth * '' Amaranthus watsonii'' – Watson's amaranth * '' Amaranthus wrightii'' – Wright's amaranth

Etymology

"Amaranth" derives from

Greek Greek may refer to: Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group *Greek language, a branch of the Indo-European language family **Proto-Greek language, the assumed last common ancestor of all kno ...

(), "unfading", with the Greek word for "flower", (), factoring into the word's development as ''amaranth, the unfading flower''. ''Amarant'' is an archaic variant. The name was first applied to the related ''

'' (''Amaranthus'' and ''Celosia'' share long-lasting dried flowers), as ''Amaranthus'' plants were not yet known in Europe.

Ecology

Amaranth weed species have an extended period of germination, rapid growth, and high rates of seed production, and have been causing problems for farmers since the mid-1990s. This is partially due to the reduction in

tillage Tillage is the agriculture, agricultural preparation of soil by mechanical wikt:agitation#Noun, agitation of various types, such as digging, stirring, and overturning. Examples of manual labour, human-powered tilling methods using hand tools inc ...

, reduction in herbicidal use and the evolution of herbicidal resistance in several species where herbicides have been applied more often. The following 9 species of ''Amaranthus'' are considered invasive and noxious weeds in the U.S. and Canada: '' A. albus'', '' A. blitoides'', '' A. hybridus'', '' A. palmeri'', '' A. powellii'', '' A. retroflexus'', '' A. spinosus'', '' A. tuberculatus'', and '' A. viridis''. A new herbicide-resistant strain of ''A. palmeri'' has appeared; it is

glyphosate Glyphosate (IUPAC name: ''N''-(phosphonomethyl)glycine) is a broad-spectrum systemic herbicide and crop desiccant. It is an organophosphorus compound, specifically a phosphonate, which acts by EPSP inhibitor, inhibiting the plant enzyme 5-en ...

-resistant and so cannot be killed by herbicides using the chemical. Also, this plant can survive in tough conditions. The species ''Amaranthus palmeri'' (Palmer amaranth) causes the greatest reduction in

soybean The soybean, soy bean, or soya bean (''Glycine max'') is a species of legume native to East Asia, widely grown for its edible bean. Soy is a staple crop, the world's most grown legume, and an important animal feed. Soy is a key source o ...

yields and has the potential to reduce yields by 17-68% in field experiments. Palmer amaranth is among the "top five most troublesome weeds" in the southeast of the United States and has already evolved resistances to dinitroaniline herbicides and acetolactate synthase inhibitors. This makes the proper identification of ''Amaranthus'' species at the seedling stage essential for agriculturalists. Proper weed control needs to be applied before the species successfully colonizes in the crop field and causes significant yield reductions. An evolutionary lineage of around 90 species within the genus has acquired the carbon fixation pathway, which increases their photosynthetic efficiency. This probably occurred in the

Miocene The Miocene ( ) is the first epoch (geology), geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and mea ...

Uses

All parts of the plant are considered edible, though some may have sharp spines that need to be removed before consumption. Amaranth is high in oxalates, but this may be partially offset by its high calcium content.

Nutrition

Uncooked

amaranth grain Species belonging to the genus ''Amaranthus'' have been cultivated for their grains for 8,000 years. Amaranth plants are classified as pseudocereals that are grown for their edible starchy seeds, but they are not in the same Family (biology), bo ...

by weight is 12% water, 65%

carbohydrate A carbohydrate () is a biomolecule composed of carbon (C), hydrogen (H), and oxygen (O) atoms. The typical hydrogen-to-oxygen atomic ratio is 2:1, analogous to that of water, and is represented by the empirical formula (where ''m'' and ''n'' ...

s (including 7%

dietary fiber Dietary fiber (fibre in English in the Commonwealth of Nations, Commonwealth English) or roughage is the portion of plant-derived food that cannot be completely broken down by human digestive enzymes. Dietary fibers are diverse in chemical co ...

), 14%

protein Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residue (biochemistry), residues. Proteins perform a vast array of functions within organisms, including Enzyme catalysis, catalysing metab ...

, and 7%

fat In nutrition science, nutrition, biology, and chemistry, fat usually means any ester of fatty acids, or a mixture of such chemical compound, compounds, most commonly those that occur in living beings or in food. The term often refers specif ...

(table). A reference serving of uncooked amaranth grain provides of

food energy Food energy is chemical energy that animals and humans derive from food to sustain their metabolism and muscular activity. Most animals derive most of their energy from aerobic respiration, namely combining the carbohydrates, fats, and protein ...

, and is a rich source (20% or more of the

Daily Value In the U.S. and Canada, the Reference Daily Intake (RDI) is used in nutrition labeling on food and dietary supplement products to indicate the daily intake level of a nutrient that is considered to be sufficient to meet the requirements of 97� ...

, DV) of

pantothenic acid Pantothenic acid (vitamin B5) is a B vitamin and an essential nutrient. All animals need pantothenic acid in order to synthesize coenzyme A (CoA), which is essential for cellular energy production and for the synthesis and degradation of prote ...

vitamin B6 Vitamin B6 is one of the B vitamins, and is an essential nutrient for humans. The term essential nutrient refers to a group of six chemically similar compounds, i.e., "vitamers", which can be interconverted in biological systems. Its active f ...

folate Folate, also known as vitamin B9 and folacin, is one of the B vitamins. Manufactured folic acid, which is converted into folate by the body, is used as a dietary supplement and in food fortification as it is more stable during processing and ...

, and several

dietary minerals In the context of nutrition, a mineral is a chemical element. Some "minerals" are essential for life, but most are not. ''Minerals'' are one of the four groups of essential nutrients; the others are vitamins, essential fatty acids, and essen ...

(table). Uncooked amaranth is particularly rich in

manganese Manganese is a chemical element; it has Symbol (chemistry), symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese was first isolated in the 1770s. It is a transition m ...

(159% DV),

phosphorus Phosphorus is a chemical element; it has Chemical symbol, symbol P and atomic number 15. All elemental forms of phosphorus are highly Reactivity (chemistry), reactive and are therefore never found in nature. They can nevertheless be prepared ar ...

(80% DV),

magnesium Magnesium is a chemical element; it has Symbol (chemistry), symbol Mg and atomic number 12. It is a shiny gray metal having a low density, low melting point and high chemical reactivity. Like the other alkaline earth metals (group 2 ...

(70% DV),

iron Iron is a chemical element; it has symbol Fe () and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, forming much of Earth's o ...

(59% DV), and

selenium Selenium is a chemical element; it has symbol (chemistry), symbol Se and atomic number 34. It has various physical appearances, including a brick-red powder, a vitreous black solid, and a grey metallic-looking form. It seldom occurs in this elem ...

(34% DV). Amaranth has a high oxalate content. Cooking leads to an apparent substantial decrease in nutritional value, though this is mainly due to an increase in water content to 75% by weight. The USDA SR-21 Legacy database also includes data on amaranth leaves, both raw and cooked. Cooked amaranth leaves are a rich source of

vitamin A Vitamin A is a fat-soluble vitamin that is an essential nutrient. The term "vitamin A" encompasses a group of chemically related organic compounds that includes retinol, retinyl esters, and several provitamin (precursor) carotenoids, most not ...

vitamin C Vitamin C (also known as ascorbic acid and ascorbate) is a water-soluble vitamin found in citrus and other fruits, berries and vegetables. It is also a generic prescription medication and in some countries is sold as a non-prescription di ...

calcium Calcium is a chemical element; it has symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to it ...

, and manganese, with moderate levels of folate, iron, magnesium, and

potassium Potassium is a chemical element; it has Symbol (chemistry), symbol K (from Neo-Latin ) and atomic number19. It is a silvery white metal that is soft enough to easily cut with a knife. Potassium metal reacts rapidly with atmospheric oxygen to ...

. Amaranth does not contain

gluten Gluten is a structural protein naturally found in certain Cereal, cereal grains. The term ''gluten'' usually refers to the elastic network of a wheat grain's proteins, gliadin and glutenin primarily, that forms readily with the addition of water ...

History

The native range of the genus is cosmopolitan. In pre-Hispanic times, amaranth was cultivated by the Aztec and their tributary communities in a quantity very similar to maize. Known to the

Aztecs The Aztecs ( ) were a Mesoamerican civilization that flourished in central Mexico in the post-classic period from 1300 to 1521. The Aztec people included different ethnic groups of central Mexico, particularly those groups who spoke the ...

as , amaranth is thought to have represented up to 80% of their energy consumption before the Spanish conquest. Another important use of amaranth throughout

Mesoamerica Mesoamerica is a historical region and cultural area that begins in the southern part of North America and extends to the Pacific coast of Central America, thus comprising the lands of central and southern Mexico, all of Belize, Guatemala, El S ...

was in ritual drinks and foods. To this day,

s are toasted much like popcorn and mixed with

honey Honey is a sweet and viscous substance made by several species of bees, the best-known of which are honey bees. Honey is made and stored to nourish bee colonies. Bees produce honey by gathering and then refining the sugary secretions of pl ...

molasses Molasses () is a viscous byproduct, principally obtained from the refining of sugarcane or sugar beet juice into sugar. Molasses varies in the amount of sugar, the method of extraction, and the age of the plant. Sugarcane molasses is usuall ...

, or

chocolate Chocolate is a food made from roasted and ground cocoa beans that can be a liquid, solid, or paste, either by itself or to flavoring, flavor other foods. Cocoa beans are the processed seeds of the cacao tree (''Theobroma cacao''); unprocesse ...

to make a treat called , meaning "joy" in Spanish. While all species are believed to be native to the Americas, several have been cultivated and introduced to warm regions worldwide. Amaranth's cosmopolitan distribution makes it one of many plants providing evidence of pre-Columbian oceanic contact. The earliest archeological evidence for amaranth in the Old World was found in an excavation in Narhan, India, dated to 1000–800 BCE. Because of its importance as a symbol of indigenous culture, its palatability, ease of cooking, and a protein that is particularly well-suited to human nutritional needs, interest in amaranth seeds (especially ''A. cruentus'' and ''A. hypochondriacus'') revived in the 1970s. It was recovered in Mexico from wild varieties and is now commercially cultivated. It is a popular snack in Mexico, sometimes mixed with chocolate or puffed rice, and its use has spread to Europe and other parts of North America.

Seed

Several species are raised for amaranth "grain" in Asia and the Americas. Amaranth and its relative

quinoa Quinoa (''Chenopodium quinoa''; , from Quechuan languages, Quechua ' or ') is a flowering plant in the Amaranthaceae, amaranth family. It is a herbaceous annual plant grown as a crop primarily for its edible seeds; the seeds are high in prote ...

are considered

s because of their similarities to cereals in flavor and cooking. The spread of ''Amaranthus'' is of a joint effort of human expansion, adaptation, and fertilization strategies. Grain amaranth has been used for food by humans in several ways. The grain can be ground into a flour for use like other grain flours. It can be popped like popcorn, or flaked like oatmeal. Seeds of Amaranth grain have been found in Antofagasta de la Sierra Department, Catamarca, Argentina in the southern Puna desert of the north of Argentina dating from 4,500 years ago, with evidence suggesting earlier use. Archeological digs unearthed ''A. cruentus'' seeds in a cave in Tehuacán, Mexico that dated to 6,000 years before present, while other digs in the same caves found ''A. hypochondriacus'' seeds dating to 1500 years before present. Ancient amaranth grains still used include the three species '' Amaranthus caudatus'', '' A. cruentus'', and ''A. hypochondriacus''. Evidence from

single-nucleotide polymorphism In genetics and bioinformatics, a single-nucleotide polymorphism (SNP ; plural SNPs ) is a germline substitution of a single nucleotide at a specific position in the genome. Although certain definitions require the substitution to be present in a ...

s and chromosome structure supports ''A. hypochondriacus'' as the common ancestor of the three grain species. It has been proposed as an inexpensive native crop that could be cultivated by indigenous people in rural areas for several reasons: * A small amount of seed plants a large area (seeding rate 1 kg/ha). * Yields are high compared to the seeding rate: 1,000 kg or more per hectare. * It is easily harvested and easily processed, post harvest, as there are no hulls to remove. * Its seeds are a source of protein.De Macvean & Pöll (1997). Chapter 8: Ethnobotany. Tropical Tree Seed Manual, USDA Forest Service, edt. J.A Vozzo. * It has rich content of the

dietary mineral In the context of nutrition, a mineral is a chemical element. Some "minerals" are essential for life, but most are not. ''Minerals'' are one of the four groups of essential nutrients; the others are vitamins, essential fatty acids, and essent ...

s, calcium, magnesium, phosphorus, and potassium. * In cooked and edible forms, amaranth retains adequate content of several

. * It is easy to cook. Boil in water with twice the amount of water as grain by volume (or 2.4 times as much water by weight). Amaranth seed can also be popped one tablespoon at a time in a hot pan without oil, shaken every few seconds to avoid burning. * It grows fast and, in three cultivated species, the large seedheads can weigh up to 1 kg and contain a half-million small seeds. In the United States, the amaranth crop is mostly used for seed production. Most amaranth in American food products starts as a ground flour, blended with wheat or other flours to create cereals, crackers, cookies, bread or other baked products. Despite utilization studies showing that amaranth can be blended with other flours at levels above 50% without affecting functional properties or taste, most commercial products use amaranth only as a minor portion of their ingredients despite them being marketed as "amaranth" products.

Leaves, roots, and stems

Amaranth species are cultivated and consumed as a

in many parts of the world. Four species of ''Amaranthus'' are documented as cultivated vegetables in eastern Asia: '' Amaranthus cruentus'', '' Amaranthus blitum, Amaranthus dubius'', and '' Amaranthus tricolor''.

Asia

In Indonesia and Malaysia, leaf amaranth is called (although the word has since been loaned to refer to

spinach Spinach (''Spinacia oleracea'') is a leafy green flowering plant native to Central Asia, Central and Western Asia. It is of the order Caryophyllales, family Amaranthaceae, subfamily Chenopodioideae. Its leaves are a common vegetable consumed eit ...

, in a different genus). In the Philippines, the Ilocano word for the plant is ; the Tagalog word for the plant is or . In

Uttar Pradesh Uttar Pradesh ( ; UP) is a States and union territories of India, state in North India, northern India. With over 241 million inhabitants, it is the List of states and union territories of India by population, most populated state in In ...

and

Bihar Bihar ( ) is a states and union territories of India, state in Eastern India. It is the list of states and union territories of India by population, second largest state by population, the List of states and union territories of India by are ...

in India, it is called and is a popular red leafy vegetable (referred to in the class of vegetable preparations called ). It is called ''chua'' in Kumaun area of Uttarakhand, where it is a popular red-green vegetable. In

Karnataka Karnataka ( ) is a States and union territories of India, state in the southwestern region of India. It was Unification of Karnataka, formed as Mysore State on 1 November 1956, with the passage of the States Reorganisation Act, 1956, States Re ...

in India, it is called (). It is used to prepare curries such as ''hulee, palya, majjigay-hulee'', and so on. In Kerala, it is called ''cheera'' and is consumed by stir-frying the leaves with spices and red chili peppers to make a dish called ''cheera thoran''. In Tamil Nadu, it is called and is regularly consumed as a favourite dish, where the greens are steamed and mashed with light seasoning of salt, red chili pepper, and cumin. It is called . In the states of Andhra Pradesh and Telangana and other Telugu speaking regions of the country, this leaf is called as "''Thotakura''" and is cooked as a standalone curry, added as a part of mix leafy vegetable curry or added in preparation of a popular ''

dal Dal is a term in the Indian subcontinent for dried, split pulses. Dal or DAL may also refer to: Places Cambodia *Dal, Ke Chong Finland * Laakso, a neighbourhood of Helsinki India * Dal Lake, in Srinagar, Jammu and Kashmir, India * Dal ...

'' called () in ( Telugu). In Maharashtra, it is called and is available in both red and white colour. In Orissa, it is called , it is used to prepare , in which the leaf is fried with chili and onions. In

West Bengal West Bengal (; Bengali language, Bengali: , , abbr. WB) is a States and union territories of India, state in the East India, eastern portion of India. It is situated along the Bay of Bengal, along with a population of over 91 million inhabi ...

, the green variant is called () and the red variant is called (). In China, the leaves and stems are used as a stir-fry vegetable, or in soups. In Vietnam, it is called and is used to make

soup Soup is a primarily liquid food, generally served warm or hot – though it is sometimes served chilled – made by cooking or otherwise combining meat or vegetables with Stock (food), stock, milk, or water. According to ''The Oxford Compan ...

. Two species are popular as edible vegetable in Vietnam: (''Amaranthus tricolor'') and or (''Amaranthus viridis'').

Africa

A traditional food plant in Africa, amaranth has the potential to improve nutrition, boost

food security Food security is the state of having reliable access to a sufficient quantity of affordable, healthy Human food, food. The availability of food for people of any class, gender, ethnicity, or religion is another element of food protection. Simila ...

, foster rural development and support sustainable land care. In Bantu regions of Uganda and western Kenya, it is known as ''doodo'' or ''litoto''. It is also known among the Kalenjin as a

drought A drought is a period of drier-than-normal conditions.Douville, H., K. Raghavan, J. Renwick, R.P. Allan, P.A. Arias, M. Barlow, R. Cerezo-Mota, A. Cherchi, T.Y. Gan, J. Gergis, D. Jiang, A. Khan, W. Pokam Mba, D. Rosenfeld, J. Tierney, ...

crop (''chepkerta''). In

Lingala Lingala (or Ngala, Lingala: ) is a Bantu languages, Bantu language spoken in the northwest of the Democratic Republic of the Congo, the northern half of the Republic of the Congo, in their capitals, Kinshasa and Brazzaville, and to a lesser de ...

(spoken in the Congo), it is known as or . In Nigeria, it is a common vegetable and goes with all Nigerian starch dishes. It is known in Yoruba as , a short form of (meaning "make the husband fat"), or (meaning "we have money left over for fish"). In Botswana, it is referred to as ''morug'' and cooked as a staple green vegetable.

Europe

In Greece, purple amaranth ('' Amaranthus blitum'') is a popular dish called , or . It is boiled, then served with olive oil and lemon juice like a salad, sometimes alongside fried fish. Greeks stop harvesting the plant (which also grows wild) when it starts to bloom at the end of August.

Americas

In Brazil, green amaranth was, and to a degree still is, often considered an invasive species as all other species of amaranth (except the generally imported ''A. caudatus'' cultivar), though some have traditionally appreciated it as a leaf vegetable, under the names of or , which is consumed cooked, generally accompanying the staple food, rice and beans. In the Caribbean, the leaves are called ''bhaji'' in Trinidad and ''callaloo'' in Jamaica, and are sautéed with onions, garlic, and tomatoes, or sometimes used in a soup called pepperpot soup.

Oil

Making up about 5% of the total

fatty acid In chemistry, in particular in biochemistry, a fatty acid is a carboxylic acid with an aliphatic chain, which is either saturated and unsaturated compounds#Organic chemistry, saturated or unsaturated. Most naturally occurring fatty acids have an ...

s of amaranth,

squalene Squalene is an organic compound. It is a triterpene with the formula C30H50. It is a colourless oil, although impure samples appear yellow. It was originally obtained from shark liver oil (hence its name, as '' Squalus'' is a genus of sharks). ...

is extracted as a vegetable-based alternative to the more expensive shark oil for use in

dietary supplements A dietary supplement is a manufactured product intended to supplement a person's diet by taking a pill, capsule, tablet, powder, or liquid. A supplement can provide nutrients either extracted from food sources, or that are synthetic ...

and

cosmetics Cosmetics are substances that are intended for application to the body for cleansing, beautifying, promoting attractiveness, or altering appearance. They are mixtures of chemical compounds derived from either Natural product, natural source ...

Dyes

The flowers of the 'Hopi Red Dye' amaranth were used by the

Hopi The Hopi are Native Americans who primarily live in northeastern Arizona. The majority are enrolled in the Hopi Tribe of Arizona and live on the Hopi Reservation in northeastern Arizona; however, some Hopi people are enrolled in the Colorado ...

(a tribe in the western United States) as the source of a deep red

dye Juan de Guillebon, better known by his stage name DyE, is a French musician. He is known for the music video of the single "Fantasy Fantasy is a genre of speculative fiction that involves supernatural or Magic (supernatural), magical ele ...

. Also a synthetic dye was named "

amaranth ''Amaranthus'' is a cosmopolitan distribution, cosmopolitan group of more than 50 species which make up the genus of annual plant, annual or short-lived perennial plants collectively known as amaranths. Some names include "prostrate pigweed" an ...

" for its similarity in color to the natural amaranth

pigment A pigment is a powder used to add or alter color or change visual appearance. Pigments are completely or nearly solubility, insoluble and reactivity (chemistry), chemically unreactive in water or another medium; in contrast, dyes are colored sub ...

s known as betalains. This synthetic dye is also known as Red No. 2 in North America and E123 in the European Union.

Ornamentals

The genus also contains several well-known ornamental plants, such as ''Amaranthus caudatus'' (love-lies-bleeding), a vigorous, hardy annual with dark purplish

flower Flowers, also known as blooms and blossoms, are the reproductive structures of flowering plants ( angiosperms). Typically, they are structured in four circular levels, called whorls, around the end of a stalk. These whorls include: calyx, m ...

s crowded in handsome drooping spikes. Another Indian annual, ''A. hypochondriacus'' (prince's feather), has deeply veined, lance-shaped leaves, purple on the under face, and deep crimson flowers densely packed on erect spikes. Amaranths are recorded as food plants for some

Lepidoptera Lepidoptera ( ) or lepidopterans is an order (biology), order of winged insects which includes butterflies and moths. About 180,000 species of the Lepidoptera have been described, representing 10% of the total described species of living organ ...

(

butterfly Butterflies are winged insects from the lepidopteran superfamily Papilionoidea, characterized by large, often brightly coloured wings that often fold together when at rest, and a conspicuous, fluttering flight. The oldest butterfly fossi ...

and

moth Moths are a group of insects that includes all members of the order Lepidoptera that are not Butterfly, butterflies. They were previously classified as suborder Heterocera, but the group is Paraphyly, paraphyletic with respect to butterflies (s ...

) species including the nutmeg moth and various case-bearer moths of the genus ''

Coleophora ''Coleophora'' is a very large genus of moths of the family Coleophoridae. It contains some 1,350 described species. The genus is represented on all continents, but the majority are found in the Nearctic and Palaearctic regions. Many authors have t ...

'': ''C. amaranthella'', ''C. enchorda'' (feeds exclusively on ''Amaranthus''), ''C. immortalis'' (feeds exclusively on ''Amaranthus''), ''C. lineapulvella'', and ''C. versurella'' (recorded on ''A. spinosus'').

Culture

Diego Durán described the festivities for the Aztec god . The Aztec month of (7 December to 26 December) was dedicated to . People decorated their homes and trees with paper flags; ritual races, processions, dances, songs, prayers, and finally

human sacrifice Human sacrifice is the act of killing one or more humans as part of a ritual, which is usually intended to please or appease deity, gods, a human ruler, public or jurisdictional demands for justice by capital punishment, an authoritative/prie ...

s were held. This was one of the more important Aztec festivals, and the people prepared for the whole month. They fasted or ate very little; a statue of the god was made out of amaranth seeds and honey, and at the end of the month, it was cut into small pieces so everybody could eat a piece of the god. After the Spanish conquest, cultivation of amaranth was outlawed, while some of the festivities were subsumed into the Christmas celebration. Amaranth is associated with longevity and, poetically, with death and immortality. Amaranth garlands were used in the mourning of

Achilles In Greek mythology, Achilles ( ) or Achilleus () was a hero of the Trojan War who was known as being the greatest of all the Greek warriors. The central character in Homer's ''Iliad'', he was the son of the Nereids, Nereid Thetis and Peleus, ...

John Milton John Milton (9 December 1608 – 8 November 1674) was an English poet, polemicist, and civil servant. His 1667 epic poem ''Paradise Lost'' was written in blank verse and included 12 books, written in a time of immense religious flux and politic ...

's ''

Paradise Lost ''Paradise Lost'' is an Epic poetry, epic poem in blank verse by the English poet John Milton (1608–1674). The poem concerns the Bible, biblical story of the fall of man: the temptation of Adam and Eve by the fallen angel Satan and their ex ...

'' portrays a showy amaranth in the

Garden of Eden In Abrahamic religions, the Garden of Eden (; ; ) or Garden of God ( and ), also called the Terrestrial Paradise, is the biblical paradise described in Genesis 2–3 and Ezekiel 28 and 31.. The location of Eden is described in the Book of Ge ...

, "remov'd from Heav'n" when it blossoms because the flowers "shade the fountain of life". He describes amaranth as "immortal" in reference to the flowers that generally do not wither and retain bright reddish tones of color, even when deceased; referred to in one species as " love-lies-bleeding."

Gallery

Amaranthus caudatus1.jpg, Love-lies-bleeding ('' A. caudatus'') Amaranthus.hybridus1web.jpg, Green amaranth (''A. hybridus'') Amaranth2.jpg, Seabeach amaranth (''A. pumilus''), an amaranth on the Federal

Threatened species A threatened species is any species (including animals, plants and fungi) which is vulnerable to extinction in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of ''critical depensatio ...

List Illustration Amaranthus retroflexus0.jpg, Red-root amaranth (''A. retroflexus'')—from Thomé, ''Flora von Deutschland, Österreich und der Schweiz'' 1885 Amaranthus.spinosus1web.jpg, Spiny amaranth ('' A. spinosus'') Amaranthus.viridis1web.jpg, Green amaranth ('' A. viridis'') Amaranth sp 2.jpg, Popping amaranth (''Amaranthus sp.'') Fepm (8).jpg, Amaranth from

Chilpancingo Chilpancingo de los Bravo (commonly shortened to Chilpancingo; ; Nahuatl: Chilpantzinco ()) is the capital and second-largest city of the Mexican state of Guerrero. In 2010 it had a population of 187,251 people. The municipality has an area of ...

References

External links

Grain amaranth, Crops For A Future
{{Authority control Leaf vegetables Tropical agriculture Asian vegetables Pseudocereals E-number additives Plants used in Native American cuisine