Description: Woody climbers with young branches ± glabrous to rusty-pubescent.
Leaves sometimes 3-veined from base, fine venation conspicuous, raised on both surfaces; petiole thickened and twisted, with base expanded into a horizontal ridge extending around the stem.
Flowers borne on leafy shoots. Tubular calyx irregular with a single lobe or long lip, or 2-lipped with a broad standard and long keel. Anthers up to 6. Stigmatic lobes up to 6.
Capsule dehiscent, usually dehiscing upwards from the base of the pedicel; seeds numerous, cordate, flattened.
Distribution and occurrence: World: c. 120 spp., trop. & temp. regions. Aust.: 1 sp. (naturalized), Qld, N.S.W., N.T.
Text by G. J. Harden