Acacia urophylla Benth.

Shrub to 3 m high, normally glabrous. Branchlets prominently yellow-ribbed. Stipules 2–8 mm long, indurate, ±pungent. Phyllodes obliquely lanceolate to ovate, with adaxial margin crenulate and normally more convex than abaxial margin, normally 5–11 cm long and 1–4 cm wide, narrowed at base, slightly undulate, acuminate, thin, prominently reticulate between the 2–4 prominent longitudinal veins per face; gland 5–10 mm above pulvinus. Inflorescences normally 2–5-headed racemes, normally 2 per node; raceme axes normally > 1–2 mm long; peduncles often appearing fasciculate, 5–14 mm long, slender; heads globular, subloosely 8–12-flowered, pale yellow or white. Flowers 4-merous; sepals c. 2/3-united. Pods narrowly linear, twisted, to c. 14 cm long, 2–4 mm wide, coriaceous to crustaceous or subwoody, black; margins thick and pale coloured. Seeds longitudinal, 3-4 mm long, oblong-elliptic, glossy, dark brown; aril terminal.

It is especially common in the Karri (Eucalyptus diversicolor) forest from near Walpole to Pemberton where it commonly forms dense regrowth populations following fire. Further N it is less common and occurs as disjunct populations along creeks in Jarrah (E. marginata) woodland or forest.