Acacia fagonioides is a shrub of the genus Acacia and the subgenus Pulchellae that is endemic to an area of south western Australia.
The spinescent shrub typically grows to a height of 0.2to with hairy, intricate branchlets with axillary spines that are in length which occur singly in the nodes. The blue-green to grey-green leaves are composed of one pair of pinnae that are about in length that have two to four pairs of pinnules that usually have an obovate to narrowly oblong-obovate shape and are in length and wide. It blooms from June to July and produces yellow flowers. The simple inflorescences are found over halfway up an axillary spine and have spherical flower-heads containing 13 to 25 yellow coloured flowers. The glabrous seed pods that form after flowering have a length of and a width of and are sometimes covered in a fine white powdery coating. the turgid seeds inside have an elliptic to circular shape with a length of .
The shrub belongs to the Acacia pulchella group of wattles and is similar in appearance to Acacia epacantha.
It is native to an area in the Wheatbelt region of Western Australia where it is typically found on sandplains growing in sandy soils. It has a disjunct distribution with population found near Toodyay, Cervantes and Eneabba where it is usually a part of heathland or Corymbia calophylla forest communities.[1]