Acacia Effusa
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''Acacia effusa'' is a shrub belonging to 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 ''Juliflorae'' that is endemic to north 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 shrub is dense and spreading typically grows to a height of . It has grey to grey-red coloured minni ritchi style bark that peels backward in small rolls. The terete branchlets are matted with dense wolly hairs but become more glabrous as they mature. Like most species of ''Acacia'' it has
phyllode Phyllodes are modified petioles or leaf stems, which are leaf-like in appearance and function. In some plants, these become flattened and widened, while the leaf itself becomes reduced or vanishes altogether. Thus the phyllode comes to serve the ...
s rather than true leaves. The evergreen phyllodes are ascending and have an obliquely oblong-elliptic to narrowly elliptic shape with a length of and a width of with a mid-nerve that is quite prominent. It blooms from May to August producing yellow flowers.


Taxonomy

The species was first formally described by the botanist Bruce Maslin in 1982 as part of the work ''Studies in the genus Acacia (Leguminosae: Mimosoideae). Acacia species of the Hamersley Range area, Western Australia'' as published in the journal '' Nuytsia''. It was reclassified as ''Racosperma effusum'' by Leslie Pedley in 2003 then transferred back to genus ''Acacia'' in 2006.


Distribution

It is native to an area in the Pilbara region of Western Australia where it is often situated on scree slopes of low ranges growing in stony red loamy soils. It has a limited range mostly within the Hamersley Range National Park where it is considered to be abundant on the lower slopes where the watercourses exit the range.


See also

* List of ''Acacia'' species


References

{{Taxonbar, from=Q9564381 effusa Acacias of Western Australia Plants described in 1982 Taxa named by Bruce Maslin