''Acacia retrorsa'' is a shrub of the genus ''
Acacia
''Acacia'', commonly known as the wattles or acacias, is a large genus of shrubs and trees in the subfamily Mimosoideae of the pea family Fabaceae. Initially, it comprised a group of plant species native to Africa and Australasia. The genus na ...
'' and the subgenus ''Phyllodineae'' that is
endemic to western
Australia
Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...
Description
The spreading prostrate shrub typically grows to a height of
[ with a sprawling habit. The multistemmed shrub has quite slender branches with a length of up to It has glabrous or slightly hairy, green coloured branchlets that have fine yellow-coloured ribbing. Like most species of ''Acacia'' it has phyllodes rather than true leaves. The sessile and evergreen phyllodes are pointing backwards. The pungent, green and glabrous have a linear shape and are straight to shallowly curved with a length of and a width of with a prominent midrib.][ It blooms from August to September and produces yellow flowers.][ The inflorescences occur on single headed ]raceme
A raceme ( or ) or racemoid is an unbranched, indeterminate type of inflorescence bearing flowers having short floral stalks along the shoots that bear the flowers. The oldest flowers grow close to the base and new flowers are produced as the s ...
s and have spherical flower-heads containing 16 to 24 light golden coloured flowers. The glarous, firmly chartaceous and dark brown seed pods that form after flowering resemble a string of beads and have a length of up to and a width of . The blackish seeds have a yellow centre and have an oblong to elliptic shape with a length of about and have a club-shaped aril
An aril (pronounced ), also called an arillus, is a specialized outgrowth from a seed that partly or completely covers the seed. An arillode or false aril is sometimes distinguished: whereas an aril grows from the attachment point of the see ...
.[
]
Taxonomy
The species was first formally described by the botanist Carl Meissner in 1855 as part of the work ''Botanische Zeitung ''. It was reclassified as ''Racosperma retrorsum'' by Leslie Pedley in 2003 then transferred back to genus ''Acacia'' in 2006.Acacia pravifolia
''Acacia pravifolia'', commonly known as the coil-pod wattle, is a shrub of the genus ''Acacia'' and the subgenus ''Phyllodineae'' that is endemic to three areas of Australia.
Description
The intricate and prickly shrub typically grows to a hei ...
'' group and superficially resembles '' Acaca declinata''.[
]
Distribution
It is native to an area in the Wheatbelt and Mid West
The Midwestern United States, also referred to as the Midwest or the American Midwest, is one of four census regions of the United States Census Bureau (also known as "Region 2"). It occupies the northern central part of the United States. I ...
regions of Western Australia where it is found growing in gravelly, sandy or loamy soils over or around laterite
Laterite is both a soil and a rock type rich in iron and aluminium and is commonly considered to have formed in hot and wet tropical areas. Nearly all laterites are of rusty-red coloration, because of high iron oxide content. They develop by ...
.
See also
* List of ''Acacia'' species
References
{{Taxonbar, from=Q9568602
retrorsa
Acacias of Western Australia
Taxa named by Carl Meissner
Plants described in 1855