Acacia longissima H.L.Wendl.

Slender shrub or small spreading tree to 5 m high. Branchlets glabrous or very sparse appressed-puberulous. Stipules scarious, less than 0.5 mm long or obscure. Phyllodes linear to linear-elliptic, commonly straight, (6–) 10–20 (–30) cm long, 1–7 (–10) mm wide, mostly acute, thin, dark green, glabrous; 3–5 (–7) main longitudinal veins with central one the most prominent, 1-veined when very narrow, longitudinal anastomoses few or absent; margins yellow; gland obscure or absent; pulvinus present. Inflorescences simple, rarely short racemose; peduncles (3–) 4–10 mm long, glabrous or rarely sparsely appressed puberulous; receptacles glabrous or rarely sparsely hairy; spikes mostly twinned, interrupted, 2.5–5 cm long, white to pale yellow; bracteoles cupular, 0.3–0.5 mm long, glabrous or almost so. Flowers scattered, 4-merous; sepals united. Pods subterete, slightly constricted between seeds, straight to shallowly curved, 9–12 cm long, 2–4 mm wide. Seeds narrowly elliptic, 5–6 mm long, dull brown; funicle thick, folded about 6 times; aril turbinate.

Mainly found in coastal areas, where it usually inhabits the borders of rainforests and it is sometimes locally common. Gullies in wet and dry sclerophyll forest, where it can grow in sandy to clay soils.

Can be grown by seedlings. Seeds needs soaking.