Tree c. 15-20 m. high, with smooth longitudinally striated dark-grey bark and spreading crown, apparently unarmed; young branchlets and leaf-and pinna-rhachides densely rusty-tomentose.
Pod indehiscent or breaking transversely at irregular intervals, c. 10-18 x 1·6-2 cm., straight or slightly twisted, mostly straight-margined.
Corolla c. 4-5 mm. long, pubescent at least towards the ends of the lobes outside.
Calyx 1·5-3 mm. long, densely puberulous to short-pubescent outside.
Flowers whitish, subsessile or very shortly pedicellate.
Inflorescences on peduncles 2-4·5 cm. long.