Shrub or tree 2-20 m high. Leaves trifoliolate or imparipinnate with 1-3 pairs of leaflets; Stipules usually elliptic, ligulate or rhomboidal, c. 0.7 by 0.4 cm, obtuse to broadly acute at apex. Inflorescence a central triad or usually pentad, the lower racemes in the axils of leaves or not; Flowers unisexual and plants dioecious; Capsules distinctly supported by receptacle, valves 2-4 by 1.3-1.8 mm at dehiscence; Seeds 0.8-1 mm long, 16 per capsule, comose at both ends, the hairs c. 0.5 mm long.
Asia-Tropical, Karkar Is present, Manus present, New Britain present, Papua New Guinea present
Malesia: Papua New Guinea (Karkar Is., Manus and New Britain).
3. Not yet recorded from New Ireland, where so far only W. fraxinea is known. 1 A shrub in open areas such as scoria slopes, or a tree in forest. 2. Appears to be closely related to W. denhamii Seem. from Vanuatu and W. vitiensis Seem. from Fiji and possibly conspecific with un-named material from the Solomons (). All have imparipinnate, coriaceous leaves with a narrowly winged petiole and predominantly unisexual flowers. Weinmannia denhamii usually has more numerous, shorter leaflets than W. croftii, and W. vitiensis has trifoliolate leaves with rather broader leaflets. The mean values for foliage characters are different for each species though the ranges overlap.