Description from Flora of China Stizolobium P. Browne;
Zoophthalmum P. Browne. Vines, perennial or annual, woody or
herbaceous. Leaves pinnately 3-foliolate; stipules usually
caducous; stipels sometimes caducous; leaflets large.
Inflorescences axillary or on old stems, condensed panicles or
often compound pseudoracemes through reduction of ultimate
peduncles to small knobs, usually with 3 flowers. Flowers large
and beautiful; bracts small or caducous. Calyx campanulate,
5-lobed, upper 2 lobes connate into a broad lip. Corolla dark
purple, red, light green, or almost white, usually dark when
dry, longer than calyx; standard usually shorter than wings and
keel, with stipe, with 2 auricles at base; wings oblong or
ovate, inflexed, usually attached to keel; keel petals partially
connate along lower margin, slightly longer than or equal to
wings, apex inflexed with horny, often hooked, apical beak.
Vexillary stamen free; anthers dimorphic, usually with beard,
longer 5 almost basifixed, shorter 5 dorsifixed. Ovary