Acacia midgleyi M.W.Mcdonald & Maslin

Tree 8–25 m high, canopy green, single-stemmed or sparingly divided near base; trunks on oldest plants to 60 (–90) cm diam. Bark hard and shallowly rimose. Branchlets subterete at extremities, glabrous. Juvenile phyllodes highly glossy. Phyllodes dimidiate to subfalcate, sometimes falcate, 8–12.5 (–16.5) cm long, (0.8–) 1–3.5 (–4.2) cm wide, glabrous, mid to dark green (fresh) drying milky green; longitudinal veins numerous, parallel, very closely-spaced (5–10 per mm) and ± touching; pulvinus 4–10 mm long. Inflorescences simple, 2–4 per axil; peduncles 3–10 mm long, glabrous; spikes 3–7 cm long, interrupted, almost cream to lemon yellow. Flowers 5-merous; calyx gamosepalous, shallowly dissected; ovary glabrous or sparsely hairy above middle. Pods narrowly oblong, flat or 1–3 times spirally twisted, ± straight, 5–12 cm long, 1–2 (–2.5) cm wide, dehiscing along ventral suture, crustose, resinous, ± transversely nerved, the nerves not prominently raised. Seeds ± transverse, ovate, elliptic or obovate, 4–7 mm long, 2–4 mm wide, glossy, black; funicle/aril many-folded, 3–10 mm long (unextended), creamy-grey or greyish (aging pale yellow).

Occurs along river banks, seasonal drainage systems and is a component of rainforests in the region.

Acacia midgleyi has commercial potential as a forestry plantation species on sites where A. peregrina (endemic in New Guinea) and A. crassicarpa perform well, but its likely success as a plantation species will depend on comprehensive provenance trials because natural stands exhibit considerable variation in habit.

Can be grown by seedlings. Seeds needs soaking.