Herbs erect or prostrate, annual or perennial, with stems or stemless. Leaves simple or 1-3-pinnately divided. Inflorescences racemose, terminal. Calyx campanulate, teeth 5, triangular, rarely enlarged into glands at base. Corolla red or yellow, funnelform, bilabiate; lobes rounded, spreading. Stamens 4, didynamous, included; anthers divergent, glabrous, spurred at base. Disc annular. Ovary sessile, 2-locular; ovules numerous, 1- or 2-rowed on each placenta. Stigma compressed, flabellate, 2-lobed. Capsule dehiscing loculicidally, long terete, erect or curved, acuminate, sometimes 4-6-angular. Seeds minute, compressed, laterally with or surrounded by transparent and membranous wings or filiform hairs.