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Shrub or small tree up to 3 m high armed with paired straight spines 1-2 cm long. Leaves bipinnate; petioles and rhachillae sparingly to densely pubescent; with 1 pinna pair; leaflets 13-20 pairs per pinna, 6-13 x 2-4 mm, venation usually fairly conspicuous on the lower surface, with marginal cilia. Inflorescence an axillary spike, axes densely pubescent; flowers sessile, yellow. Ovary densely pilose. Pod straight or slightly falcate, 10-20 cm long, 0.8-1 cm wide, somewhat compressed, margin slightly constricted between the seeds, segments oblique, finely longitudinally venose, beaked apically.
A medium sized tree. It grows 4.5-12 m high and spreads 4.5-12 m wide. The bark is smooth and dark brown. The branches are velvety and covered with spines. The leaves are compound. They are narrow and dull green. They have 2-3 leaflets and each of these have 15-20 pairs of small leaflets. They have fine hairs over them. The flowers are yellow or green and are in clusters. The fruit are brown pods. They are 7-22 cm long by 7-12 mm wide.
Perennial, multi-stemmed tree or shrub (thorntree-like), 1-6 m high; armed with paired straight spines. Leaves bipinnately compound in pairs, greyish green to dark green. Leaflets small, pubescent, oblong. Inflorescences: axillary spikes. Flowers yellow. Flowering time June-Nov. Pod slender, linear to slightly curved, woody.
Like P. glandulosa (and hybridising with it) but all parts, at least when young, covered with short velvety hairs, leaflets small (6-13 mm long) and closely spaced, pod yellowish, ± straight to markedly curved.
