Leaves: gland on upper side of petiole low, sessile, up to c. 0·25 mm. high; pinnae 4-46(56) pairs; leaflets 12-48 pairs, 2-5(7·5) x 0·5-1·5(2·5) mm., oblong-linear to linear, symmetric and obtuse or sometimes subacute at the apex, ± appressed-pubescent on one or both surfaces or on the margins only, glabrescent or not later; midrib nearly central (except at the base); lateral nerves not distinct beneath, rarely slightly raised.
Tree, rarely shrubby, 1·5-18 m. high, deciduous; crown rounded or flat; bark fissured, rough; young branchlets with rather short dense spreading grey to golden pubescence.
Flowers white or flushed-pink, subsessile or up to 1·5 mm. pedicellate; bracteoles very caducous, fallen by flowering time.
Pod apparently indehiscent, 10-28 x 2-5 cm., linear-oblong, puberulous over the surface, brown.
Staminal tube not or scarcely exserted beyond the corolla; filaments c. 0·5-1·2 cm. long.
Corolla 3·5-7 mm. long, puberulous or pubescent outside.
Calyx 1-2 mm. long, puberulous or pubescent outside.
Seeds 8-13 x 7-8 mm., flattened.