Small, annual, profusely branched herb. Stem small, branched, 4-angled, ± winged. Leaves subsessile-sessile, elliptic-ovate, 1-3 nerved. Inflorescence a lax (-dense) terminal-axillary cynic, 2-3 branched. Flowers tetramerous. Calyx campanulate, lobes elliptic-lanceolate. Corolla greenish yellow, lobes ovate-oblong. Stamens 4: 3 short and sterile; 1 long, perfect and fertile. Ovary unilocular, globose-ellipsoid, ovules many on 2 intruded placenta; style short; stigma 2-lobed. Capsule ellipsoid-globose, 2-valved, seeds many, small, reticulated.