Unarmed tree up to 20 m high; young branchlets angular, glabrous or the young shoots minutely pubescent. Leaves phyllodic, apparently simple, glabrous, mostly 6-12 x 0.6-1.2(2.5) cm, linear-lanceolate to oblanceolate or narrowly obovate, straight to falcate, narrowed basally, with 3-7 prominent longitudinal nerves and a conspicuous reticulate venation between the longitudinal nerves (on young plants bipinnate leaves are sometimes produced at the apex of the phyllode). Inflorescences globose, solitary or in short axillary racemes. Flowers pale yellowish-white; peduncles up to 6 mm long. Calyx more than half as long as the corolla. Corolla glabrous. Pods brown, 5-15 x 0.6-0.8 cm, oblong, falcate or variously coiled or spirally twisted, flattened, margins thickened, not constricted between the seeds, dehiscing longitudinally along both margins. Seeds dark brownish-black, 4-5 x ±2.5 mm, smooth, compressed; areole ±3x1 mm; funicle very long, thickened, almost encircling the seed in a double fold.