Acacias of Australia

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Acacia trinervata Sieber ex DC.

Common Name

Three-veined Wattle




Restricted to western Sydney and adjacent lower Blue Mtns, N.S.W.


Shrub or tree 1.5–4 m high. Branchlets angular apically, later ±terete with low ridges, glabrous except commonly with minute resin-hairs. Phyllodes sessile, patent to inclined, linear to narrowly oblong or slightly elliptic, straight to shallowly incurved, 1.5–4 (–5) cm long, 1–3 mm wide, coarsely pungent, acute, mucronate, ±rigid-coriaceous, glabrous, with 2 or 3 raised distant main nerves and rare anastomoses. Inflorescences simple; peduncles (7–) 10–20 mm long, glabrous except for resin-hairs; heads globular, 3.5–5.5 mm diam., 24–45-flowered, golden to pale yellow. Flowers 5-merous; sepals 1/2–3/4-united. Pods linear, slightly raised over seeds, straight or slightly curved, to 12 cm long, 2–3.5 mm wide, coriaceous, glabrous. Seeds longitudinal, oblong, 3.5–5.5 mm long, dark brown or black; aril apical.


Grows on sandstone in eucalypt communities.


N.S.W.: East Kurrajong, R.Coveny 4100 & R.Bisby (A n.v., AD n.v., BRI n.v., CANB n.v., K n.v., L n.v., NSW, PERTH, U n.v., US n.v.).


See R.S.Cowan & B.R.Maslin, Nuytsia 10: 82–83 (1995), for discussion of nomenclature and synonymy.

Perhaps related to A. elongata; possibly also to A. bynoeana. Possibly hybridises with A. implexa.

FOA Reference

Data derived from Flora of Australia Volumes 11A (2001), 11B (2001) and 12 (1998), products of ABRS, ©Commonwealth of Australia



Minor edits by B.R.Maslin