Rather polymorphic prickly, dull green, spreading-erect, spindly or bushy shrubs, 1-4 m high, sometimes procumbent with a few trailing branches; branchlets light green, prominently angular, striate, often pubescent. <P>Phyllodes acicular, or flattened and then narrow-lanceolate, 0.8-1.5 cm long, 1-2 mm broad, mostly whorled but some on same branches alternate or fascicled, sessile, rigid, divaricate or reflexed, 1 prominent central vein tapering into a pungent point. <P>Inflorescences simple, 1-3 per axil; spikes dense, 8-15 mm long; peduncles and receptacles glabrous or slightly hairy, 1-2 cm long; flowers 4-merous. <P>Legumes linear, 3-8 cm long, 3-4 mm broad, flat, straight or curved, dark brown, margins pale, slightly thickened, not constricted between seeds. Seeds longitudinal; funicle short, folded below a fleshy aril.<P>