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Perennial woody lianes or subshrubs, evergreen; latex white. Stems without spines. Leaves petiolate, opposite; lamina entire, herbaceous to coriaceous, with simple, basifixed or medifixed trichomes; colleters absent. Inflorescence terminal or axillary, an elongate panicle of small, dichasially branched, sessile or pedunculate cymes. Flowers ±scented, pedicellate. Calyx with or without colleters. Corolla salverform; tube shortly cylindrical, slightly constricted about stamens, and slightly narrower above, glabrous or with scattered indumentum towards top; lobes dextrorse in bud. Corolline corona absent. Stamens included, variously inserted in tube, adherent to style-head; anthers lanceolate-sagittate. Disc annular to 5-lobed. Style-head apiculate-globose. Fruits of 2 woody follicles, cylindrical to fusiform. Seeds numerous, linear to linear-oblong, compressed, unwinged, comose at micropylar end.
Plants scramblers or woody lianas, with latex. Leaves opposite. Inflorescences cymose, terminal and/or axillary. Flowers small. Calyx with basal glands inside, lobes free. Corolla white, yellowish, or red, salverform; tube widened near base, throat hairy; lobes oblong, falcate, overlapping to right, in bud with inflexed distal halves. Stamens included, inserted at or below middle of corolla tube; filaments very short; anthers sagittate, adherent to pistil head, cells spurred at base; disc entire, 5-crenate or 5-denate, or deeply divided into 5 erect segments. Ovaries adnate basally to disc, pubescent; ovules numerous. Pistil head ovoid or cup-shaped. Follicles 2, spreading or divaricate. Seeds numerous, linear, compressed, not or hardly beaked, comose; endosperm copious; cotyledons long, flat, radicle superior.
