Acacia rigidula Benth.

Fabaceae (Legume family)


Blackbrush is a perennial, warm-season native. This shrubby tree grows to 12 feet tall and produces limbs from a central trunk. The zigzag branches have short, straight thorns in pairs.

The leaves are twice compound, with both divisions having one to eight small leaflets, typical of the legume family. The flowers are white. The 2- to 4-inch-long seed pods are narrow, curved and flat, have divisions between the seeds, and are reddish brown when ripe.

This tree provides fair grazing for wildlife and poor grazing for livestock.


Blackbrush is common on South Texas brushland. It is most often found on sandy or calcareous soils and on limestone caliche ridges and hills.