Large lianas. Twigs with a distinct gland-field on the nodes. Leaves digitately compound; leaflets 3-5, sessile or short-stalked, only articulated at the base of the petiolule, mostly unequal, terminal one largest, often with a metallic hue above (s.s.)9 both faces with numerous microscopical glandlets, underneath besides with few, flat, scattered, larger, round glands ¼-½ mm Ø. Thyrses-flowered, terminal, axillary to ramiflorous. Calyx proportionally small, cupular to campanulate, truncate and minutely toothed, or shallowly 5-lobed by tearing. Corolla short-campanulate or more often ± curved, narrow trumpet-shaped, glabrous, or outside at least the lobes puberulous-papillose; lobes deltoid, valvate, tomentose on the inner margin, lobes or tube inside sometimes with larger hairs; tube with a dense ring of long hairs at the insertion of the stamens. Stamens 4, didynamous, exserted, 5th rudimentary; anther-cells divaricate. Disk cupular, enveloping the ovary base. Ovary glabrous; style exserted; stigma 2-lamellate, 2-celled, with 2 placentas in each cell and ovules. Capsules stipitate, c. 10-20 cm long, narrow oblong, terete to broad-ellipsoid in section, beaked; valves boat-shaped. Seeds, thin-winged, rectangular.
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