''Tacca leontopetaloides'' is a species of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants th ...

in the yam family

Dioscoreaceae Dioscoreaceae () is a family of monocotyledonous flowering plants, with about 715 known species in nine genera. The best-known member of the family is the yam (some species of ''Dioscorea''). The APG system (1998) and APG II system (2003) both ...

. It is native to Island Southeast Asia but have been introduced as

canoe plants One of the major human migration events was the maritime settlement of the islands of the Indo-Pacific by the Austronesian peoples, believed to have started from at least 5,500 to 4,000 BP (3500 to 2000 BCE). These migrations were accompani ...

throughout the Indo-Pacific tropics by

Austronesian peoples The Austronesian peoples, sometimes referred to as Austronesian-speaking peoples, are a large group of peoples in Taiwan, Maritime Southeast Asia, Micronesia, coastal New Guinea, Island Melanesia, Polynesia, and Madagascar that speak Austro ...

during prehistoric times. They have become naturalized to

tropical The tropics are the regions of Earth surrounding the Equator. They are defined in latitude by the Tropic of Cancer in the Northern Hemisphere at N and the Tropic of Capricorn in the Southern Hemisphere at S. The tropics are also referred to ...

Africa Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area ...

South Asia South Asia is the southern subregion of Asia, which is defined in both geographical Geography (from Greek: , ''geographia''. Combination of Greek words ‘Geo’ (The Earth) and ‘Graphien’ (to describe), literally "earth descr ...

, northern Australia, and

Oceania Oceania (, , ) is a geographical region that includes Australasia, Melanesia, Micronesia, and Polynesia. Spanning the Eastern and Western hemispheres, Oceania is estimated to have a land area of and a population of around 44.5 million ...

. Common names include Polynesian arrowroot, Fiji arrowroot, East Indies arrowroot, and pia.

History of cultivation

Polynesian arrowroot is an ancient Austronesian root crop closely related to yams. It is originally native to Island Southeast Asia. It was introduced throughout the entire range of the

Austronesian expansion The Austronesian peoples, sometimes referred to as Austronesian-speaking peoples, are a large group of peoples in Taiwan, Maritime Southeast Asia, Micronesia, coastal New Guinea, Island Melanesia, Polynesia, and Madagascar that speak Austron ...

during prehistoric times (c. 5,000 BP), including

Micronesia Micronesia (, ) is a subregion of Oceania, consisting of about 2,000 small islands in the western Pacific Ocean. It has a close shared cultural history with three other island regions: the Philippines to the west, Polynesia to the east, and ...

Polynesia Polynesia () "many" and νῆσος () "island"), to, Polinisia; mi, Porinihia; haw, Polenekia; fj, Polinisia; sm, Polenisia; rar, Porinetia; ty, Pōrīnetia; tvl, Polenisia; tkl, Polenihia (, ) is a subregion of Oceania, made up of ...

, and

Madagascar Madagascar (; mg, Madagasikara, ), officially the Republic of Madagascar ( mg, Repoblikan'i Madagasikara, links=no, ; french: République de Madagascar), is an island country in the Indian Ocean, approximately off the coast of East Africa ...

. Polynesian arrowroot have been identified as among the cultivated crops in Lapita sites in

Palau Palau,, officially the Republic of Palau and historically ''Belau'', ''Palaos'' or ''Pelew'', is an island country and microstate in the western Pacific. The nation has approximately 340 islands and connects the western chain of the ...

, dating back to 3,000 to 2,000 BP. It was also introduced to Sri Lanka, southern India, and possibly also Australia through trade and contact. Polynesian arrowroot was a minor staple among Austronesians. The roots are bitter if not prepared properly, thus it was only cultivated as a secondary crop to staples like ''

Dioscorea alata ''Dioscorea alata'', also known as purple yam, ube (, ), or greater yam, among many other names, is a species of yam (a tuber). The tubers are usually a vivid violet-purple to bright lavender in color (hence the common name), but some range in ...

'' and '' Colocasia esculenta''. Its importance increased for settlers in the Pacific Islands, where food plants were scarcer, and it was introduced to virtually all the inhabited islands. They were valued for their ability to grow in low islands and

atoll An atoll () is a ring-shaped island, including a coral rim that encircles a lagoon partially or completely. There may be coral islands or cays on the rim. Atolls are located in warm tropical or subtropical oceans and seas where corals can gr ...

s, and were often the staple crops in islands with these conditions. In larger islands, they were usually allowed to grow wild and were useful only as

famine food A famine food or poverty food is any inexpensive or readily available food used to nourish people in times of hunger and starvation, whether caused by extreme poverty, such as during economic depression or war, or by natural disasters such ...

. Several cultivars have been developed in Polynesia due to the centuries of artificial selection. The starch extracted from the root with traditional methods can last for a very long time, and thus can be stored or traded. The starch can be cooked in leaves to make starchy puddings, similar to the use of starch extracted from sago palms (''

Metroxylon sagu ''Metroxylon sagu'', the true sago palm, is a species of palm in the genus '' Metroxylon'', native to tropical southeastern Asia. The tree is a major source of sago starch. Description True sago palm is a suckering (multiple-stemmed) palm, ...

''). Due to the introduction of modern crops, it is rarely cultivated today.

Description

Several petioles in length extend from the center of the plant, on which the large leaves ( long and up to wide) are attached. The leaf's upper surface has depressed

veins Veins are blood vessels in humans and most other animals that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated b ...

, and the under surface is shiny with bold yellow veins. The leaves are "palmately incised and/or divided into 3-13 lobes, each lobe pinnately divided into numerous smaller ones".

Flower A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants (plants of the division Angiospermae). The biological function of a flower is to facilitate reproduction, usually by providing a mechani ...

s are borne on tall stalks in greenish-purple

umbel In botany, an umbel is an inflorescence that consists of a number of short flower stalks (called pedicels) that spread from a common point, somewhat like umbrella ribs. The word was coined in botanical usage in the 1590s, from Latin ''umbella'' "p ...

-like clusters surrounded by large bracts, each single flower with long, threadlike

bracteole In botany, a bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis or cone scale. Bracts are usually different from foliage leaves. They may be smaller, larger, or o ...

s. The plant is usually dormant for part of the year and dies down to the ground. Later, new leaves will arise from the round underground

tuber Tubers are a type of enlarged structure used as storage organs for nutrients in some plants. They are used for the plant's perennation (survival of the winter or dry months), to provide energy and nutrients for regrowth during the next growin ...

. The tubers are hard and

potato The potato is a starchy food, a tuber of the plant ''Solanum tuberosum'' and is a root vegetable native to the Americas. The plant is a perennial in the nightshade family Solanaceae. Wild potato species can be found from the southern Unit ...

-like, with a brown skin and white interior.

Uses

The tubers of Polynesian arrowroot contain starch, making it an important food source for many

Pacific Island Collectively called the Pacific Islands, the islands in the Pacific Ocean are further categorized into three major island groups: Melanesia, Micronesia, and Polynesia. Depending on the context, the term ''Pacific Islands'' may refer to one of se ...

cultures, primarily for the inhabitants of low islands and

s. Polynesian arrowroot was prepared into a flour to make a variety of puddings. The

s were first grated and then allowed to soak in fresh water. The settled starch was rinsed repeatedly to remove the bitterness and then dried. The flour was mixed with mashed

taro Taro () (''Colocasia esculenta)'' is a root vegetable. It is the most widely cultivated species of several plants in the family Araceae that are used as vegetables for their corms, leaves, and petioles. Taro corms are a food staple in Afri ...

, breadfruit, or '' Pandanus'' fruit extract and mixed with

coconut cream Coconut milk is an opaque, milky-white liquid extracted from the grated pulp of mature coconuts. The opacity and rich taste of coconut milk are due to its high oil content, most of which is saturated fat. Coconut milk is a traditional food in ...

to prepare puddings. In

Hawaii Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the only U.S. state outside North America, the only state that is an archipelago, and the only state ...

, a local favorite is

haupia Haupia is a traditional coconut milk-based Hawaiian dessert often found at luaus and other local gatherings in Hawaii. Since the 1940s, it has become popular as a topping for white cake, especially at weddings. Although technically considered ...

, which was originally made with ''pia'' flour, coconut cream and kō (

cane sugar Sucrose, a disaccharide, is a sugar composed of glucose and fructose subunits. It is produced naturally in plants and is the main constituent of white sugar. It has the molecular formula . For human consumption, sucrose is extracted and refine ...

). Today, Polynesian arrowroot has been largely replaced by

cornstarch Corn starch, maize starch, or cornflour (British English) is the starch derived from corn (maize) grain. The starch is obtained from the endosperm of the kernel. Corn starch is a common food ingredient, often used to thicken sauces or so ...

. The starch was additionally used to stiffen fabrics, and on some islands, the stem's

bast fibre Bast fibre (also called phloem fibre or skin fibre) is plant fibre collected from the phloem (the "inner bark", sometimes called "skin") or bast surrounding the stem of certain dicotyledonous plants. It supports the conductive cells of the phl ...

s were woven into mats. In traditional Hawaiian medicine the raw

s were eaten to treat

stomach The stomach is a muscular, hollow organ in the gastrointestinal tract of humans and many other animals, including several invertebrates. The stomach has a dilated structure and functions as a vital organ in the digestive system. The stomach i ...

ailments. Mixed with

water Water (chemical formula ) is an Inorganic compound, inorganic, transparent, tasteless, odorless, and Color of water, nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living ...

and red

clay Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4). Clays develop plasticity when wet, due to a molecular film of water surrounding the clay par ...

, the plant was consumed to treat

diarrhea Diarrhea, also spelled diarrhoea, is the condition of having at least three loose, liquid, or watery bowel movements each day. It often lasts for a few days and can result in dehydration due to fluid loss. Signs of dehydration often begin w ...

and

dysentery Dysentery (UK pronunciation: , US: ), historically known as the bloody flux, is a type of gastroenteritis that results in bloody diarrhea. Other symptoms may include fever, abdominal pain, and a feeling of incomplete defecation. Complications ...

. This combination was also used to stop internal hemorrhaging in the

and colon and applied to wounds to stop bleeding.

Gallery

File:Tacca leontopetaloides - umbel.jpg, Inflorescence (umbel) Tacca leontopetaloides - flower (6694935793).jpg, Flower with 6 tepals, 6 stamens and 3-lobed stigma Tacca leontopetaloides 48143668.jpg, Infructescence Tacca leontopetaloides - tuber (6659237845).jpg, Tuber

Notes

References

* .

External links

{{Taxonbar, from=Q1577447 Dioscoreaceae Root vegetables Flora of Africa Flora of South America Flora of tropical Asia Flora of the Northwestern Pacific Flora of the Southwestern Pacific Flora of Australia Plants described in 1891 Tropical flora Hawaiian cuisine Niuean cuisine