Herbs or small shrubs, mostly branched. Leaves sessile or petiolate, 3-5-veined or 3-pliveined. Inflorescences axillary and/or terminal, dichasial panicles. Flowers 5-merous; calyx deeply 5-lobed, lobes imbricate; corolla tubular, regularly 5-lobed; stamens 5, inserted halfway corolla tube, filaments short, anthers sagittate-ovate, connective sometimes bidentate; pollen in monads; stigma 2-lobed. Fruit a capsule, oblong-ellipsoid, with persistent calyx; seeds areolate.


Guianas: present S America: present SE Venezuela: present
A genus with 7 species in S America, with the centre of distribution in SE Venezuela; 1 species in the Guianas.


Tapeinostemon Benth. in Hooker, J. Bot. Kew Gard. Misc. 6: 194. 1854 sec. by Marion J. Jansen-Jacobs. - Tapeinostemon in JEANETTE ALLOGIO, LAURA COBB, JASON R. GRANT, MARION J. JANSEN-JACOBS, MATT KINKADE, KATHERINE B. LEPIS, HILTJE MAAS-VAN DE KAMER, PAUL J.M. MAAS, MATTHEW I. PALMER & S. MOTA DE OLIVEIRA, FLORA OF THE GUIANAS, Series A: Phanerogams Fascicle 30 139. GENTIANACEAE. 2012