Leaves pale green, narrowly elliptic, narrowly ovate-elliptic or linear, 3.5-15 x 0.5-2.5(-4) cm; secondary veins, if visible, slightly prominent above and beneath. Inflorescence 7-30 cm long, including peduncle of 0.5-2 cm long; bracts and bracteoles ovate, 1-4 mm long(basal bracts sometimes leaf-like, up to 60 mm long); pedicels 1-2 mm long. Flowers horizontal, regularly arranged; calyx yellow or green, 5-7.5 mm long, calyx lobes 3-5.5 x 1-2 mm; corolla white or, in throat, pink to purple, 10-16 mm long, corolla lobes erect or in all directions, 5-9 x 1.5-3 mm, apex acuminate; filaments white, 3-3.5 mm long, anthers white or yellow, 2.5-3.5 mm long; ovary narrowly ellipsoid, 4 x 1.5 mm, style white, 5-6 mm long, stigma lobes white or pale yellow, 1-1.5 x 0.5-1 mm. Fruiting pedicel 2-3 mm long. Fruit dark green or greenish-black, narrowly ellipsoid to ovoid, 6-8 x 2.5-3 mm; seeds 0.4 mm in diam.
Venezuela, the Guianas, Brazilian Amazon; 73 collections studied, of which 68 from the Guianas (GU: 51; SU: 9; FG: 8).