Leucas

Annual or perennial herbs or subshrubs. Inflorescence of few-many-flowered, often subspherical, whorls; bracts leaf-like; bracteoles linear, ascending. Calyx tubular, 10-nerved, straight or curved, with 5-10 equal or unequal spine-tipped teeth. Corolla 2-lipped, white; upper lip usually entire and hairy; lower lip 3-lobed, the middle lobe longest. Stamens 4.

Similar to the genus Acrotome. The differences are explained under that genus.

Erect annual herb, up to 1m. Usually unbranched stems, finely hairy. Leaves opposite, ovate to ovate-lanceolate, margins coarsely serrate-crenate. Inflorescence of several spaced, many-flowered verticils with long thistle-like calyx teeth. Flowers small, white.

Common

It is native to South America and the West Indies, and may be native or introduced in Africa.