Cleome kalachariensis Gilg & Gilg-ben.

Erect annual herb 20-75 cm tall, rather sparingly branched. Stems striate, viscid glandular-pubescent; pubescence of dense, short stipitate glands. Leaves 3(-5)-foliolate, petiolate, aromatic, glandular-pubescent; petioles up to 3.5 cm long; leaflets linear-spathulate to oblanceolate-oblong or linear-oblong, 1-3.2 cm long, 2-6 mm broad, becoming progressively smaller towards the inflorescence and grading into the bracts, obtuse to rounded at the apex, cuneate at the base. Inflorescence a terminal raceme, elongating in fruit; bracts similar to the leaves but smaller, sessile, usually 3-, rarely 1-foliolate, glandular-pubescent; pedicels 0.9-2.5 cm long. Sepals ovate-elliptic to lanceolate, 5-6 mm long, acuminate, glandular-puberulous outside. Petals yellow, often reflexed, obovate, 0.9-1.5 cm long, 4-9 mm broad, rounded at the apex, narrowed to a short claw at the base. Stamens 13-25, all fertile, unequal, with 4 or 5 longer and stouter than the rest, equalling the petals; filaments lilac to purple; anthers brownish yellow, about 1.5 mm long. Ovary about 1 mm long on a short gynophore about 1 mm long; style 1 mm long; stigma sub-capitate. Capsule erect, linear, straight or slightly curved, 3-4 cm long, 3 mm broad; valves glandular-puberulous, thin-textured, longitudinal veins anastomosing; gynophore slender, glabrous, 5-11 mm long; style 3-4 mm long. Seeds dark brown, circular in outline, 1-25 mm in diameter, transversely rugose.