Lianas, the branchlets terete, hollow, without interpetiolar glandular fields; pseudostipules inconspicuous or ± spathulate and early deciduous. Leaves 3-foliolate; terminal leaflet often replaced by a simple or trifid tendril, conspicuously pellucid-punctate from lepidote-peltate glands on the lower surface. Inflorescence a few-flowered axillary raceme. Calyx campanulate, sometimes ± inflated, pubescent, irregularly shallowly bilabiate to 5-lobed; corolla white to magenta, puberulous outside. Anthers glabrous or slightly puberulous on margin of thecal opening, straight, divaricate. Ovary linear-tetragonal, lepidote; ovules 2-seriate in each locule. Fruit a narrow, linear capsule, the valves parallel to the septum, thin, convex, usually faintly striate and ± pubescent. Seeds thin, 2-winged, the wings membranous, brownish, weakly demarcated from seed body.
Southern Mexico, Central America, Colombia, Venezuela, Suriname, French Guiana, Ecuador, Peru, Brazil, Bolivia; 3 species, 2 in Venezuela, both of these in the flora area.
1. Branchlets and petiolules reddish-hispid; tendrils trifid; corolla pink or pinkish at least on lobes; calyx expanded-campanulate, membranous; fruit villous pubescent ..... S. inaequilaterum
1. Branchlets and petiolules grayish or yellowish puberulous; tendrils simple; corolla white or cream; calyx short, campanulate, chartaceous; fruit short-puberulous ..... S. riparium
Stizophyllum inaequilaterum Bureau & K. Schum. in Mart., Fl. Bras. 8(2): 221. 1896.
Liana. Moist and wet nonflooded evergreen lowland to montane forests, 100-900 m; Bolívar (Amaruay-tepui, Kavanayén), Amazonas (near Puerto Ayacucho). Costa Rica, Panama, Colombia, Suriname, Ecuador, Peru, Amazonian Brazil, Bolivia. Fig. 414.
Material from the flora area is sterile and is only tentatively identified to this species.
Stizophyllum riparium (H.B.K.) Sandwith, Lilloa 3: 462. 1938. -Bignonia riparia H.B.K., Nov. Gen. Sp. (quarto ed.) 3: 138. 1818 .
Liana. Nonflooded evergreen lowland moist forests, tepui slope forests, 100-500(-900) m; widely scattered in Bolívar and Amazonas. Barinas, Táchira; southern Mexico, Central America, Colombia, French Guiana, Ecuador, Amazonian Peru, Brazil, and Bolivia. Fig. 415.