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Alternanthera Caracasana
''Alternanthera caracasana'' is a species of flowering plant in the family Amaranthaceae known by the common names khakiweed, washerwoman and mat chaff flower. It is native to Central and South America but is well-known elsewhere as a noxious weed. It is naturalized in some areas and invasive in others and can be found across the southern half of the United States, Australia (where many people are unaware it is not native), Spain and parts of Africa. The plant has long, prostrate stems covered in small leaves which vary in shape from diamond to rounded. It grows from a rhizome and often roots from its lower nodes. Each spike inflorescence is under a centimeter wide and is covered in tiny stiff white flowers. This is a tough weed of lots, roads, railroad tracks, cleared areas, and other places that are rough, sandy, and often well-traveled.
It is often confused with khaki burr, which it is related to, but it sports masses of sharp V-shaped prickles that are easily detached and e ...
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C4 Carbon Fixation
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 supplied with 14, incorporate the 14C label into four-carbon molecules first.
fixation is an addition to the ancestral and more common carbon fixation. The main carboxylating enzyme in photosynthesis is called RuBisCO, which catalyses two distinct reactions using either (carboxylation) or oxygen (oxygenation) as a substrate. The latter process, oxygenation, gives rise to the wasteful process of photorespiration. photosynthesis reduces photorespiration by concentrating around RuBisCO. To ensure that RuBisCO works in an environment where there is a lot of carbon dioxide and very little oxygen, leaves generally differentiate two partially isolated compartments called mesophyll cells and bundle-sheath cells. is initially fixed in the ...
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Alternanthera Angustifolia
''Alternanthera angustifolia'' (narrow-leaf joyweed) is a small herb in family Amaranthaceae found widely in inland Australia from northern Western Australia, the Northern Territory, South Australia, New South Wales to Queensland
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, nickname = Sunshine State
, image_map = Queensland in Australia.svg
, map_caption = Location of Queensland in Australia
, subdivision_type = Country
, subdivision_name = Australia
, established_title = Before federation
, established_ ....
It is a prostrate (or decumbent) annual herb, growing from 2 cm to 30 cm high, on sandy soils on creek and river banks. Its small white flowers may be seen from April to August.
''Alternanthera angustifolia'' was first described in 1810 by Robert Brown. References
External linksALA: ''Alternanthera angustifolia'': images and occurrence data
angustifolia
Plants described in 1810
Taxa named by Robert Brown (botanist, born 1773)
{{Amaranthaceae-stub ...
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