Annual or perennial herbs (in
ours). Stems not twining. Leaves alternate. Bracteoles minute, ± linear, rarely 0. Flowers usually resupinate, zygomorphic. Corolla
usually 2-lipped with upper lip 2-lobed, lower 3-lobed (rarely all petals form a single lip). (The terms 'upper' and 'lower'
assume flowers are resupinate). Anthers (5) united into a tube; the two lower or all of them penicillate at tip, the two lower ones somewhat shorter than others. Ovary inferior to
± superior, 2-locular. Stigma lobes 2, surrounded
by a ring of hairs. Fruit a capsule dehiscing by
2, rarely 4, apical valves; or, rarely indehiscent.
Worldwide: c. 300 species in tropical and warm areas, a few temperate.
Zimbabwe: 1 cultivated taxon.