Perennial shrub 2-3 m high. Stems glabrous but pubescent on younger branches.  Leaves broadly elliptical, acuminate at both ends 6-12 cm x 3-6 cm; inflorescence a lax racemes 10-15 cm long, corolla tubular 2.5 mm long, white and purple; fruit 4 spherical nutlets with verrucose pericarp, 1.2 mm in diameter.

Annual or perennial of 50 cm in height, occasionally with leaning branches. Elongated, ovate or punctate leaves from 3 to 7 cm long. Flowers in spikes of 1.5 to 3 cm in length emerging from the axils of the leaves. Pilose 2 mm capsules.

Erect annual herb 30-60 cm high. Stems pubescent, leaves elliptic, ovate or sub-rhombic, 2-4 cm x 1-2 cm, tip acute, base narrow, margins lightly dentate or entire, glabrous except on veins; inflorescence verticillate ca. 20 cm long; corolla white to mauve, 4-5 mm long; fruit an oblong, black, minutely verrucose, nutlet.

Annual, glandular-pubescent, robust herb, 1-3 m high. Leaves sub-sessile, oblong, lanceolate to elliptic, 10-50 cm x 3-30 cm, base decurrent on stem, apex acute to acuminate, margins entire, membranous; inflorescence a terminal panicles to 30 cm long, corolla pink, 5 cm long; fruit an ovoid capsule, 15-20 mm long; seeds brown, ridged, globose or ellipsoid, 0.5 mm long.