Sebaea ambigua Cham.

Erect annual herbs, usually stout and unbranched from the base, 3.5-20 cm high. Leaves 0.6-1.5 cm long, 0.5-1.5 cm broad, ovate, ovate-cordate or ovate-orbicular, obtuse or rounded. Inflorescence many-flowered, of compact, head-like, bracteate cymes; bracts ovate, ovate-rhomboid or ovate-lanceolate, foliaceous. Calyx of 4 segments, each 3-5 mm long, 1.25-3 mm broad, obovate or obovate-cuneate, the margin erose or erose-laciniate in the upper part, the sides hyaline, joined for 0.5-1 mm, faintly keeled below and with a small, thick apical wing 1-2 mm long and 0.5-1 mm broad. Corolla yellow; tube 3.5-6 mm long; lobes 3.5-5 mm long, 2-3.5 mm broad, ovate, ovate-oblong or more or less elliptic rounded, truncate, or emarginate. Filaments 1.5-2.5 mm long, inserted in the corolla-sinuses; anthers 1.5-2.5 mm long, their tips recurved, each with an apical gland. Style and stigma 4-6 mm long, with a median stigmatic swelling; stigma capitate or clavate, 2-lobed.