Leaves in distant pairs; the upper 10–30 x 2.5–5 mm., oblong or lanceolate, obtuse at the apex; narrowed into a petiole-like base; the lower ovate to elliptic, shortly petiolate.
Corolla divided almost to the base; tube very short; lobes 3–5 x 2–3 mm., elliptic, obtuse at the apex, with a pair of fimbriate nectaries within, near the base.
Flowers 4–5 merous, whitish or cream-white, in terminal and axillary 1–5 flowered corymbiform cymes, pedicellate; pedicels very variable.
Calyx divided almost to the base; lobes very unequal, 1–3.5 x 0.25–0.5 mm., elliptic to elliptic-lanceolate acute at the apex.
Stem slender, erect sometimes ligneous at the base, branching from the base, more rarely branching at the apex.
Stamens inserted in the sinuses; filaments 3–3.5 mm. long; anthers 0.7–0.8 mm. long, oblong-ellipsoid.
Ovary 3.5–4.5 mm., ellipsoid or oblong, narrowed into a short stout style; stigma subsessile, bilobed.
Capsule 4–5 x 2.5–3 mm., ellipsoid to narrowly so, attenuate rostrate at the apex.
Seeds 0.3–6.4 mm. in diam., subglobose; testa faveolate.
Annual, erect herb. up to 50 cm. tall.