Acacia dorsenna is a shrub belonging to the genus Acacia and the subgenus Phyllodineae that is endemic to Western Australia.
The dense domed shrub typically grows to a height of 1to and 3m (10feet) wide. The smooth dull green phyllodes have an elliptic to obovate shape. The phyllodes are around in length and have a width of with obscure midrib and lateral nerves.[1] It blooms from August to September producing yellow flowers. The inflorescences are found in groups of seven to ten. The spherical flower-heads contain 15 to 21 bright golden yellow flowers. The narrowly oblong brown seed pods that form after flowering have a length of around and a width of . The oblong-elliptic shaped seeds have a length of up to .[1]
It is a member of the Acacia prainii and resembles Acacia camptoclada and some forms of Acacia merrallii.[1]
It is native to a small area in the Goldfields-Esperance region of Western Australia in a small area in the Dundas where it is found on low rocky hills growing in rocky sandy-loam-clay soils. Only two populations of the shrub are known both of which are located about to the north of Norseman in mallee or shrubland communities.[1]