Tall trees, sometimes with small, knee-like pneumatophores; bark grey to brown, irregularly cracked and flaking; branchlets often 4-angled, glabrous or hairy. Leaves large, petiolate, oblong to elliptic, to broadly ovate, entire, with small domatia, glabrous above, mostly hairy beneath. Inflorescences terminal and/or axillary, of 3-many dense spherical heads with pubescent receptacles, flowering branches developing monopodially; bracteoles linear-spathulate, surrounding the free, sessile flowers; buds pubescent at apex. Calyx tubular, limb truncate or distinctly lobed; epicalyx sometimes present. Corolla: tube funnel-shaped, glabrous; lobes erect, pubescent outside, terminated by short, subulate, glabrous, deciduous appendages. Anthers included. Ovaries free, 2-locular; ovules many, ascending and imbricate on subpeltate placentas; style distinctly exserted, pollen presenter ovoid or mitriform. Fruit dry, dehiscing septicidally, endocarp splitting into two valves, each with rounded lobes. Seeds small, with winged margin.
Species 3, trop. Africa; sthn trop. Afr. 2 or 3, Angola, Zambia, Malawi.
Mitragyna Korth., in part; Halle: 32 (1970); Ridsdale: 43 (1978); White et al.: 479 (2001).