Creeping Saltbush
   HOME

TheInfoList



OR:

Atriplex semibaccata, commonly known as Australian saltbush, berry saltbush, or creeping saltbush, is a species of flowering plant in the family Amaranthaceae and is endemic to Australia. It is a perennial
herb In general use, herbs are a widely distributed and widespread group of plants, excluding vegetables and other plants consumed for macronutrients, with savory or aromatic properties that are used for flavoring and garnishing food, for medicinal ...
native to Western Australia, South Australia, Queensland and New South Wales, but has been introduced into other states and to overseas countries. It flowers and fruits in spring, and propagates from seed when the fruit splits open. This species of saltbush is adapted to inconsistent rainfall, temperature and humidity extremes and to poor soil. It is used for rehabilitation, medicine, as a
cover crop In agriculture, cover crops are plants that are planted to cover the soil rather than for the purpose of being harvested. Cover crops manage soil erosion, soil fertility, soil quality, water, weeds, pests, diseases, biodiversity and wildlife i ...
and for
fodder Fodder (), also called provender (), is any agriculture, agricultural foodstuff used specifically to feed domesticated livestock, such as cattle, domestic rabbit, rabbits, sheep, horses, chickens and pigs. "Fodder" refers particularly to food g ...
. Its introduction to other countries has had an environmental and economic impact on them.


Description

''Atriplex semibaccata'' is a taproot perennial herb, that has prostrated and decumbent characteristics. Native to Australia and widespread in all mainland Australian states, ''A. semibaccata'' thrives in harsh and saline conditions. ''A. semibaccata'' is often mat-forming or semi-erect and can grow 40–80 cm tall, spanning a diameter of 1.5-2m. Its slender branches arise from a woody taproot. Leaves are white scruffy,
subsessile In botany, sessility (meaning "sitting", used in the sense of "resting on the surface") is a characteristic of plant parts (such as flowers and leaves) that have no stalk. Plant parts can also be described as subsessile, that is, not completely ...
(small stalk) and are spatulate or obovate (oblong or elliptic) when the plant is young. Leaves develop a green to grey-green colour, with a length of 5-30mm and a width of 2-9mm, where the base is tapered and tip obtuse. Leaves are thin, oblong-elliptic, obtuse and have short
petiolate Petiole may refer to: *Petiole (botany), the stalk of a leaf, attaching the blade to the stem *Petiole (insect anatomy) In entomology, petiole is the technical term for the narrow waist of some hymenopteran insects, especially ants, bees, a ...
(1–2 cm). Staminate flowers are tiny, terminal and 1.5mm wide, whereas
pistillate flowers This glossary of botanical terms is a list of definitions of terms and concepts relevant to botany and plants in general. Terms of plant morphology are included here as well as at the more specific Glossary of plant morphology and Glossary o ...
cluster distally from leaves. ''A. semibaccata is'' monoecious. Fruiting bracteoles are red or orange when mature, as well as having a convex and rhombic shape (diamond like appearance). Fruits are
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 ...
, united at base, margin toothed, sessile and are a length of 4-6mm.Heuzé V., Thiollet H., Tran G., 2016. Creeping saltbush (Atriplex semibaccata). Feedipedia, a programme by INRA, CIRAD, AFZ and FAO. https://www.feedipedia.org/node/183 ''A. semibaccata'' is seed propagated and seeds are dimorphic. Black seeds are 1.5-1.7mm, while brown seeds are 2mm in size. It can be used as
fodder Fodder (), also called provender (), is any agriculture, agricultural foodstuff used specifically to feed domesticated livestock, such as cattle, domestic rabbit, rabbits, sheep, horses, chickens and pigs. "Fodder" refers particularly to food g ...
and is useful for degraded or salt affected land. Optimal conditions for habitat, include dry/subtropical climate and direct sunlight. ''A. semibaccata'' has an all-year season of interest and a
plant hardiness Hardiness of plants describes their ability to survive adverse growing conditions. It is usually limited to discussions of climatic adversity. Thus a plant's ability to tolerate cold, heat, drought, flooding, or wind are typically considered measur ...
zone of 4. ''A. semibaccata'' requires light
hydration Hydration may refer to: * Hydrate, a substance that contains water * Hydration enthalpy, energy released through hydrating a substance * Hydration reaction, a chemical addition reaction where a hydroxyl group and proton are added to a compound * ...
in soil that is either clay,
loam Loam (in geology and soil science) is soil composed mostly of sand (particle size > ), silt (particle size > ), and a smaller amount of clay (particle size < ). By weight, its mineral composition is about 40–40–20% concentration of sand–sil ...
, peat, sand or silt as well as a
soil pH Soil pH is a measure of the acidity or basicity (alkalinity) of a soil. Soil pH is a key characteristic that can be used to make informative analysis both qualitative and quantitatively regarding soil characteristics. pH is defined as the neg ...
that is neutral.


Taxonomy and naming

''Atriplex semibaccata'' was first formally described in 1810 by Robert Brown in his '' Prodromus Florae Novae Hollandiae et Insulae Van Diemen''. The species is classified in the Amaranthaceae family and Chenopodiaceae subfamily, along with other halophytic plants (salt-tolerant) species. ''A. semibaccata'' has several reported varieties such as var. ''melanocarpa'', var. ''biformis,'' var. ''microcarpa'' var. '' gracilis'' and var. ''appendiculata''. These variations include the morphological differences within this species. Australia's native range is centred on bracteoles, which are the succulent fruits of ''A. semibaccata.'' There are two forms of ''A. semibaccata'' in Australia. In Western Australia and southern arid areas are home to rhomboid and succulent bracteoles, whereas slim dry and deltoid shaped bracteoles are found in Queensland and New South Wales. ''A. semibaccata'' hybridises with Atriplex spinibractea, where both species subside in New South Wales. This formed the variant, known as A. neurivalvis in
northern Northern may refer to the following: Geography * North, a point in direction * Northern Europe, the northern part or region of Europe * Northern Highland, a region of Wisconsin, United States * Northern Province, Sri Lanka * Northern Range, a ra ...
Queensland, where succulence is not apparent in its bracteoles. Genetic variability analysis with the use of molecular markers has investigated ''A. semibaccata'' and other species of the genus ''Atriplex''. Phylogenetic analysis has confirmed a deviation from all other tested species ('' A. halimus, A. amnicola'', '' A. lentiformis'', '' A. canescens,'' ''A. undulata'' and '' A. nummularia'').  ''A. semibaccata'' is distinguished as one of two major groups that are least similar to the other species. The common names for ''A. semibaccata'' include the ''Australia saltbush.'' It is also commonly called ''Australian saltweed, creeping saltbush'' and ''berry saltbush''. This is one of many ''Atriplex'' species native to Australia and is referenced widely in
North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...
. The genus name Atriplex has Latin origins from the ‘''atriplexum''’, which has been derived from the Greek word ‘''astraphaxes''’, which translates to "''saltbush''" or "''orach''". The species
epithet An epithet (, ), also byname, is a descriptive term (word or phrase) known for accompanying or occurring in place of a name and having entered common usage. It has various shades of meaning when applied to seemingly real or fictitious people, di ...
‘''semibaccata''’ is derived from the Latin word ‘''semi''’ which translates to "half", while ‘''baccata''’ means "bearing berries".


Distribution and habitat

This species of saltbush is endemic to Australia and is native to Western Australia, South Australia, Queensland and New South Wales, but has become
naturalised Naturalization (or naturalisation) is the legal act or process by which a non-citizen of a country may acquire citizenship or nationality of that country. It may be done automatically by a statute, i.e., without any effort on the part of the in ...
in the Australian Capital Territory, on
Norfolk Island Norfolk Island (, ; Norfuk: ''Norf'k Ailen'') is an external territory of Australia located in the Pacific Ocean between New Zealand and New Caledonia, directly east of Australia's Evans Head and about from Lord Howe Island. Together with ...
and possibly Tasmania. It has also been introduced to North and South America, North Africa, the Horn of Africa, the Middle East, Arabian Peninsula, Asia, and the Mediterranean region.  A. ''semibaccata'' was introduced to different regions worldwide as a drought and salt tolerant fodder crop. Similarly, A. ''semibaccata'' was introduced in Tasmania for grazing purposes. Located in heavy soil that is slightly
saline Saline may refer to: * Saline (medicine), a liquid with salt content to match the human body * Saline water, non-medicinal salt water * Saline, a historical term (especially US) for a salt works or saltern Places * Saline, Calvados, a commune in ...
, in woodland that is close to
salt lake A salt lake or saline lake is a landlocked body of water that has a concentration of salts (typically sodium chloride) and other dissolved minerals significantly higher than most lakes (often defined as at least three grams of salt per litre). ...
s, and is usually an invader of disturbed areas. First reported distribution was in California in 1901 as a livestock forage in
alkali In chemistry, an alkali (; from ar, القلوي, al-qaly, lit=ashes of the saltwort) is a basic, ionic salt of an alkali metal or an alkaline earth metal. An alkali can also be defined as a base that dissolves in water. A solution of a ...
ne regions. Seeds were soon after distributed (1916) and by 1940, A. ''semibaccata'' inhabited southern coast regions and irregularly inland. Optimal conditions for habitat, include dry/
subtropical The subtropical zones or subtropics are geographical zone, geographical and Köppen climate classification, climate zones to the Northern Hemisphere, north and Southern Hemisphere, south of the tropics. Geographically part of the Geographical z ...
climate and direct sunlight.


Ecology


Reproductive biology

''A. semibaccata'' reproduces by seed propagation. This appears when the fruiting bracteoles split when ripe and dry, exposing an individual seed. The seed is with ascending radicle. ''A. semibaccata'' is self-compatible and
wind pollinated Anemophily or wind pollination is a form of pollination whereby pollen is distributed by wind. Almost all gymnosperms are anemophilous, as are many plants in the order Poales, including grasses, sedges, and rushes. Other common anemophilous pla ...
''.'' Male flowers occur as small glomerules in distal axils, while female flowers appear in scattered axillary clusters. Seed persistence in soil and
germination Germination is the process by which an organism grows from a seed or spore. The term is applied to the sprouting of a seedling from a seed of an angiosperm or gymnosperm, the growth of a sporeling from a spore, such as the spores of fungi, fer ...
conditions are unknown. ''A. semibaccata'' does not obtain
dormancy Dormancy is a period in an organism's life cycle when growth, development, and (in animals) physical activity are temporarily stopped. This minimizes metabolic activity and therefore helps an organism to conserve energy. Dormancy tends to be clo ...
when germination rates are high. In Australia, ''A. semibaccata'' flowers and fruits in spring and
summer Summer is the hottest of the four temperate seasons, occurring after spring and before autumn. At or centred on the summer solstice, the earliest sunrise and latest sunset occurs, daylight hours are longest and dark hours are shortest, wit ...
, however flowering is prolonged in Western Australia. ''A. semibaccata'' in the
northern hemisphere The Northern Hemisphere is the half of Earth that is north of the Equator. For other planets in the Solar System, north is defined as being in the same celestial hemisphere relative to the invariable plane of the solar system as Earth's Nort ...
( USA) typically flowers in spring (March–May), summer (June–August) and early winter (December–February).


Physiology and phenology

The development of C4 photosynthesis has played a role in the evolutionary success of the Atriplex genus. Various C4 Chenopodiaceae plants differ from the
Kranz anatomy carbon fixation or the Hatch–Slack pathway is one of three known photosynthetic processes of carbon fixation in plants. It owes the names to the 1960's discovery by Marshall Davidson Hatch and Charles Roger Slack that some plants, when suppl ...
of Atriplex, which includes a layer of
bundle sheath cells 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 includ ...
surrounding the vascular bundle, as well as radially arranged palisade cells, with little variation in C4 leaf types. Depending on the immediate environmental conditions, ''A. semibaccata'' demonstrates the ability to adapt. This relates to environmental conditions such as air temperature,
soil moisture Soil moisture is the water content of the soil. It can be expressed in terms of volume or weight. Soil moisture measurement can be based on ''in situ'' probes (e.g., capacitance probes, neutron probes) or remote sensing methods. Water that enters ...
,
salinity Salinity () is the saltiness or amount of salt dissolved in a body of water, called saline water (see also soil salinity). It is usually measured in g/L or g/kg (grams of salt per liter/kilogram of water; the latter is dimensionless and equal ...
and
evaporation Evaporation is a type of vaporization that occurs on the surface of a liquid as it changes into the gas phase. High concentration of the evaporating substance in the surrounding gas significantly slows down evaporation, such as when humidi ...
. Greater exposure to a saline environment, induces a salt stress response which displays a decrease number of
chloroplast A chloroplast () is a type of membrane-bound organelle known as a plastid that conducts photosynthesis mostly in plant and algal cells. The photosynthetic pigment chlorophyll captures the energy from sunlight, converts it, and stores it in ...
s in chlorenchyma and bundle sheath cells, as well as a decreased root diameter, leaf size, leaf stromal conductance and the net leaf photosynthetic rate. Higher saline exposure increases intracellular CO2 concentration and the number of stomata per unit leaf area. During winter, ''A. semibaccata'' becomes dormant, whereas other ''Atriplex'' species maintain function. Low and inconsistent rainfall, varying temperatures, humidity and poor soil are contributing factors that involve ''A. semibaccata'' to adapt.


Cultivation


Environmental requirements

''A. semibaccata'' is native to Australia, however it is not located in tropical and
humid Humidity is the concentration of water vapor present in the air. Water vapor, the gaseous state of water, is generally invisible to the human eye. Humidity indicates the likelihood for precipitation, dew, or fog to be present. Humidity depen ...
regions such as Northern Queensland. It is a drought tolerant species of
subtropical The subtropical zones or subtropics are geographical zone, geographical and Köppen climate classification, climate zones to the Northern Hemisphere, north and Southern Hemisphere, south of the tropics. Geographically part of the Geographical z ...
arid and semi-arid regions. A region with a mean annual rainfall of 250-900mm is optimal for ''A. semibaccata''. It is a low spreading and deep-rooted sub-shrub that does not require much
soil moisture Soil moisture is the water content of the soil. It can be expressed in terms of volume or weight. Soil moisture measurement can be based on ''in situ'' probes (e.g., capacitance probes, neutron probes) or remote sensing methods. Water that enters ...
. Sun exposed regions are an optimal condition for growth.  ''A. semibaccata'' is winter tolerant and can survive a minimum air temperature of -5 °C. ''A. semibaccata'' is salt-laden wind tolerant and has been indicated as an environmental advantage against plants that are distributed along
coastal region The coast, also known as the coastline or seashore, is defined as the area where land meets the ocean, or as a line that forms the boundary between the land and the coastline. The Earth has around of coastline. Coasts are important zones in n ...
s. Additionally, saline soil allows for rapid and more profuse seed
germination Germination is the process by which an organism grows from a seed or spore. The term is applied to the sprouting of a seedling from a seed of an angiosperm or gymnosperm, the growth of a sporeling from a spore, such as the spores of fungi, fer ...
. This is a competitive advantage, against native species worldwide. ''A.'' ''semibaccata'' has a high degree of salt tolerance (9-16 dS/m) and grows in soil that is exposed to light and is acidic. ''A. semibaccata'' grows in various soil types, including clay loams, sandy loams and waterlogged environments.


Movement and dispersal

Natural dispersion of ''A. semibaccata'' are over short distances as seeds are found under remnant and understorey plants. Animal dispersion expands the distance covered of ''A. semibaccata''. The red fruiting
bract 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 of ...
eoles of ''A. semibaccata'' are
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 ...
and are attractive to
herbivore A herbivore is an animal anatomically and physiologically adapted to eating plant material, for example foliage or marine algae, for the main component of its diet. As a result of their plant diet, herbivorous animals typically have mouthpart ...
species. Species that eat the fruiting bracteoles are responsible for animal dispersion and spread the seed of A. semibaccata. ''A. semibaccata'' seeds have been found in the digestive tract of 
reptile Reptiles, as most commonly defined are the animals in the class Reptilia ( ), a paraphyletic grouping comprising all sauropsids except birds. Living reptiles comprise turtles, crocodilians, squamates (lizards and snakes) and rhynchocephalians ( ...
s, birds and
fox Foxes are small to medium-sized, omnivorous mammals belonging to several genera of the family Canidae. They have a flattened skull, upright, triangular ears, a pointed, slightly upturned snout, and a long bushy tail (or ''brush''). Twelv ...
es in California, USA.  Accidental introduction of ''A. semibaccata'' is a result of relocating hay and other fodder crops. ''A. semibaccata'' was introduced internationally to various countries, to acquire the drought and saline resistant properties that allow for use as a
fodder Fodder (), also called provender (), is any agriculture, agricultural foodstuff used specifically to feed domesticated livestock, such as cattle, domestic rabbit, rabbits, sheep, horses, chickens and pigs. "Fodder" refers particularly to food g ...
and ground cover ''A. semibaccata'' is intentionally dispersed for its uses.


Uses


Cover crop

In its native range of Australia, ''A. semibaccata'' is used in
agroforestry Agroforestry is a land use management system in which trees or shrubs are grown around or among crops or pastureland. Trees produce a wide range of useful and marketable products from fruits/nuts, medicines, wood products, etc. This intentional ...
to improve the performance and profitability of vineyards. ''A. semibaccata'' has been introduced to regions with reduced water availability due to drought and increased temperatures, as a sustainable
cover crop In agriculture, cover crops are plants that are planted to cover the soil rather than for the purpose of being harvested. Cover crops manage soil erosion, soil fertility, soil quality, water, weeds, pests, diseases, biodiversity and wildlife i ...
that deters potential
pest Pest or The Pest may refer to: Science and medicine * Pest (organism), an animal or plant deemed to be detrimental to humans or human concerns ** Weed, a plant considered undesirable * Infectious disease, an illness resulting from an infection ** ...
species. Native perennial cover crops such as ''A. semibaccata'' can increase the abundance of
symbiotic Symbiosis (from Greek , , "living together", from , , "together", and , bíōsis, "living") is any type of a close and long-term biological interaction between two different biological organisms, be it mutualistic, commensalistic, or parasit ...
invertebrates that can improve pest control and limit the need of synthetic pest controls.


Rehabilitation

''A. semibaccata'' has been used for regenerative purposes, where it has been planted to restore mine spoils. ''A. semibaccata'' is adaptive to the saline and drought conditions of mining waste and exhibits germination among these regions. ''A. semibaccata'' has also been used for landscaping purposes and as ground cover to control soil and erosion.  ''A. semibaccata'' is an effective weed control in verges,
roundabout A roundabout is a type of circular intersection or junction in which road traffic is permitted to flow in one direction around a central island, and priority is typically given to traffic already in the junction.''The New Shorter Oxford En ...
s and nature strips. Additional uses of ''A. semibaccata'' includes
land reclamation Land reclamation, usually known as reclamation, and also known as land fill (not to be confused with a waste landfill), is the process of creating new land from oceans, seas, riverbeds or lake beds. The land reclaimed is known as reclamati ...
without the need for saline water irrigation systems and restoring bare patches of ground.


Fodder/ Animal feed

''A. semibaccata'' is used as saltland pasture and produces
fodder Fodder (), also called provender (), is any agriculture, agricultural foodstuff used specifically to feed domesticated livestock, such as cattle, domestic rabbit, rabbits, sheep, horses, chickens and pigs. "Fodder" refers particularly to food g ...
for grazing animals when sources of paddock feed are limited. This can improve production from saltland sites, reduce salt movement and stabilise soil structure. ''A. semibaccata'' is a readily grazed ''Atriplex'' saltbush, which provides a more diverse diet and primary fodder/ animal feed. The high salt content in foliage reduces the use of ''A. semibaccata'' as a food source if availability of drinking water for livestock is not adequate. ''A. semibaccata'' is palatable when young, contains a low energy value and is a source of crude protein. Additional food supplements and adequate drinking water are necessary for livestock.


Medicinal

''A. semibaccata''
essential oil An essential oil is a concentrated hydrophobic liquid containing volatile (easily evaporated at normal temperatures) chemical compounds from plants. Essential oils are also known as volatile oils, ethereal oils, aetheroleum, or simply as the o ...
s contain compounds with antibacterial and
antioxidant Antioxidants are compounds that inhibit oxidation, a chemical reaction that can produce free radicals. This can lead to polymerization and other chain reactions. They are frequently added to industrial products, such as fuels and lubricant ...
properties. The essential oils of ''A. semibaccata'' are moderately
synergistic Synergy is an interaction or cooperation giving rise to a whole that is greater than the simple sum of its parts. The term ''synergy'' comes from the Attic Greek word συνεργία ' from ', , meaning "working together". History In Christi ...
with
gentamicin Gentamicin is an antibiotic used to treat several types of bacterial infections. This may include bone infections, endocarditis, pelvic inflammatory disease, meningitis, pneumonia, urinary tract infections, and sepsis among others. It is not e ...
, which is an antibiotic that is used to treat several bacterial infections. ''A. semibaccata'' is suitable for revegetation of marginal lands, with the use of its
biomass Biomass is plant-based material used as a fuel for heat or electricity production. It can be in the form of wood, wood residues, energy crops, agricultural residues, and waste from industry, farms, and households. Some people use the terms bi ...
as an essential oil for the control of microbial infections. Additionally,
alcohol Alcohol most commonly refers to: * Alcohol (chemistry), an organic compound in which a hydroxyl group is bound to a carbon atom * Alcohol (drug), an intoxicant found in alcoholic drinks Alcohol may also refer to: Chemicals * Ethanol, one of sev ...
extracts from ''A. semibaccata'', such as scopoletin, coumarin,
scopolin Scopolin is a glucoside of scopoletin formed by the action of the enzyme scopoletin glucosyltransferase. References Bibliography

* * O-methylated coumarins Phenol glucosides {{aromatic-stub ...
, umbelliferorne, 7-methoxy coumarin, phenolic acid and P-coumaric acid has antibacterial activity. Isolated compounds from ''A. semibaccata'', such as compounds tyramine and lignanamide exhibit
cytotoxic Cytotoxicity is the quality of being toxic to cells. Examples of toxic agents are an immune cell or some types of venom, e.g. from the puff adder (''Bitis arietans'') or brown recluse spider (''Loxosceles reclusa''). Cell physiology Treating cells ...
activity against the
proliferation Proliferation may refer to: Weapons *Nuclear proliferation, the spread of nuclear weapons, material, and technology *Chemical weapon proliferation, the spread of chemical weapons, material, and technology * Small arms proliferation, the spread of ...
of leukemia lymphoblasts (CCRF-CEM) cells.


Environmental impact

''A. semibaccata'' is grown and dispersed over short distances. This creates a dense fire-retardant ground cover that displaces native plant species. ''A. semibaccata'' is identified as an
invasive Invasive may refer to: *Invasive (medical) procedure *Invasive species *Invasive observation, especially in reference to surveillance *Invasively progressive spread of disease from one organ in the body to another, especially in reference to cancer ...
species by the US Fish and Wildlife service and is known to affect
endangered species An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and inv ...
such as
Panicum niihauense ''Panicum niihauense'' is a rare species of grass known by the common names ''lau 'ehu'' and Niihau panicgrass. It is endemic to Hawaii, where it has been found on the islands of Niihau and Kauai. It has not been observed on Niihau since 1949, a ...
(critically endangered),
Verbesina dissita ''Verbesina dissita'' is a rare species of flowering plant in the family Asteraceae known by the common name bigleaf crownbeard. It is native to northern Baja California in Mexico, where it is known from about 23 occurrences, although some of the ...
and
Sesbania tomentosa ''Sesbania tomentosa'', commonly known as Oahu riverhemp and ''ōhai'', is an endangered species of plant in the pea family, Fabaceae, that is endemic to the main Hawaiian Islands as well as Nihoa and Necker Island. It inhabits low shrublands ...
. Scaevola coriacea and
Sesbania tomentosa ''Sesbania tomentosa'', commonly known as Oahu riverhemp and ''ōhai'', is an endangered species of plant in the pea family, Fabaceae, that is endemic to the main Hawaiian Islands as well as Nihoa and Necker Island. It inhabits low shrublands ...
are native and endangered grass species of Hawaii, USA.  Scaevola coriacea is found in three naturally occurring populations and Sesbania tomentosa is located on the island of
Molokai Molokai , or Molokai (), is the fifth most populated of the eight major islands that make up the Hawaiian Islands, Hawaiian Islands archipelago in the middle of the Pacific Ocean. It is 38 by 10 miles (61 by 16 km) at its greatest length an ...
. In California, USA , ''A. semibaccata'' competes with native plants such as Verbesina dissita for space, shade, water and light. ''A. semibaccata'' creates an ecological shift that is caused by competition for resources, shading, ecosystem change and habitat alteration. ''A. semibaccata'' enhances biodiversity through biological control. Agroecosystems that involve ''A. semibaccata'' increase the abundance of invertebrates that assist in pest control as well as an increased range of predators and
parasitoid In evolutionary ecology, a parasitoid is an organism that lives in close association with its host (biology), host at the host's expense, eventually resulting in the death of the host. Parasitoidism is one of six major evolutionarily stable str ...
s. ''A. semibaccata'' acts as a
cover crop In agriculture, cover crops are plants that are planted to cover the soil rather than for the purpose of being harvested. Cover crops manage soil erosion, soil fertility, soil quality, water, weeds, pests, diseases, biodiversity and wildlife i ...
that provides shelter for various invertebrates, this increases biodiversity and bioactivity. This provides the environment for natural breakdown of organic material, aeration and nutrient cycling that keeps ''A. semibaccata'' and surrounding vegetation healthy. Additionally, this abundant soil diversity supports pest predators that prevent harmful organisms from over populating. This prevents the destruction of crops. ''A. semibaccata'' improves the quality and structure of soil, suppresses weeds and contributes to pest management. File:Starr 031007-2051 Atriplex semibaccata.jpg, Invasive growth in Kahoolawe, Hawaii File:Atriplex semibaccata by Scott Zona - 003.jpg, Invasive growth in the
Canary Islands The Canary Islands (; es, Canarias, ), also known informally as the Canaries, are a Spanish autonomous community and archipelago in the Atlantic Ocean, in Macaronesia. At their closest point to the African mainland, they are west of Morocc ...
, Spain File:Starr 081230-0706 Atriplex semibaccata.jpg, Invasive growth of in Kahoolawe, Hawaii


Economic impact

The economic impact of ''A. semibaccata'' is positive in regions where it is not
invasive Invasive may refer to: *Invasive (medical) procedure *Invasive species *Invasive observation, especially in reference to surveillance *Invasively progressive spread of disease from one organ in the body to another, especially in reference to cancer ...
. Benefits that have a positive economic effect include its value in rehabilitation, medicinal properties as well as food and cover cropper. The negative economic impact is generated by its
invasiveness Minimally invasive procedures (also known as minimally invasive surgeries) encompass surgical techniques that limit the size of incisions needed, thereby reducing wound healing time, associated pain, and risk of infection. Surgery by definition ...
that endangers native species, causes a change in ecological and alters the surrounding biodiversity. This requires physical and chemical control processes that can be laborious and require economic expenditure. Control chemicals for ''A. semibaccata'' involve
herbicide Herbicides (, ), also commonly known as weedkillers, are substances used to control undesired plants, also known as weeds.EPA. February 201Pesticides Industry. Sales and Usage 2006 and 2007: Market Estimates. Summary in press releasMain page fo ...
s, such as dicamba, dicamba/MCPA amine, 2,4-D and picloram/ 2,4-D.  To physically remove ''A. semibaccata'', hand pulling is an effective method due to its small size. To physically control ''A. semibaccata'', it must be uprooted prior to seed production. Site revision is required to remove plants arising from residual seed pools.


References


External links


FAO:''Atriplex semibaccata''USDA Plants Profile: ''Atriplex semibaccata'' NSW Flora Online: ''Atriplex semibaccata''Online Field Guide to Common Saltmarsh Plants of Queensland
{{Taxonbar, from=Q4817608 semibaccata Caryophyllales of Australia Flora of New South Wales Flora of the Northern Territory Flora of South Australia Flora of Victoria (Australia) Eudicots of Western Australia Taxa named by Robert Brown (botanist, born 1773) Forages Edible fruits