Annual or perennial herbs, erect or spreading, simple or branched at the base, sometimes branched in the upper part, up to 100 cm high. Leaves up to 2-5 cm long and 3 cm broad, ovate to ovate-orbicular, membranous or somewhat leathery, obtuse or subacute, often apiculate; upper leaves smaller and sometimes narrower, ovate-oblong to ovate-lanceolate. Inflorescence corymbose or paniculate-corymbose, subdense or of dense cymes contracted into round, almost headlike inflorescences when young; sometimes axillary branches ending in 1 or more cymes, cymes 1-several-flowered; bracts ovate to linear-lanceolate, acute, recurved. Calyx of 5 segments, each 4-7-5 mm long, 1-3 mm broad, lanceolate to elliptic, acute or acuminate, mucronate, the sides hyaline, often overlapping widely, joined for a short distance at the base, sharply keeled or with a wing up to 0 • 75 mm broad, broadest below or towards the middle. Corolla yellow or rich yellow; tube 3-25-7 mm long; lobes 3-6-5 mm long, 1-5-3-5 mm broad, elliptic to ovate or somewhat obovate above the claw or cuneate at the base, rounded at the apex. Filaments 0
