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Tree, rarely shrubby, 1.5–12(? 15) m. high, deciduous; crown rounded or flat; bark fissured, rough. Young branchlets with rather short dense spreading grey to golden pubescence. Leaves: gland on upper side of petiole low, sessile, up to about 0.25 mm. high; pinnae 4–46 pairs; leaflets 12–48 pairs, oblong to linear, 2–5(–7.5) mm. long, 0.5–1.5(–2.5) mm. wide, symmetrical and obtuse or sometimes subacute at apex, ± appressed-pubescent on one or both sides or on margins only, glabrescent or not later; midrib nearly central (except at base); lateral nerves not distinct beneath, rarely slightly raised. Flowers white or flushed pink, subsessile or up to 1.5 mm. pedicellate; bracteoles very caducous, fallen by flowering time. Calyx 1–2 mm. long, puberulous or pubescent outside. Corolla 3.5–7 mm. long, puberulous or pubescent outside. Staminal tube not or scarcely exserted beyond corolla; filaments about 0.5–1.2 cm. long. Pod oblong, 10–28 cm. long, 2–5 cm. wide, puberulous over surface, brown. Seeds 8–13 mm. long, 7–8 mm. wide, flattened.