Acacia caesaneura, commonly known as western blue mulga, is a shrub or tree belonging to the genus Acacia and the subgenus Juliflorae that is endemic to western Australia.
The multi-stemmed shrub with a height of eventually mature to a tree with a height of with an obconic habit with dense crowns. The densely haired branchlets have discrete resinous ribs towards the apices. Like most species of Acacia it has phyllodes rather than true leaves. The evergreen and variable phyllodes are straight and dimidiate to sickle shaped recurved and usually with a narrowly oblong to elliptic shape. The phyllodes are not rigid and have a length of and a width of with many longitudinal nerves.[1]
It is native to an area of the Goldfields-Esperance and Mid West regions of Western Australia. The bulk of the population is found from around Yalgoo in the west to around Meekatharra in the north down to around Kalgoorlie in the south extending to around the northern edge of the Nullarbor Plain in the east. A. caesaneura if often situated on plains or undulating country growing in red-brown sandy loam to clay soils sometimes over hardpan as a part of Acacia shrubland or woodland communities.[1]