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Annual herb, 40-60 cm, often branched. Stem and branches obtusely 4-angled, hirsute. Leaves membranaceous, oblong or lanceolate-ovate, 5-8.5 by 2-4.5 cm, obtuse, base cuneate or rounded, entire; margin elsewhere serrate-crenate; appressed-hirsute on both surfaces; petiole 1-1.5 cm, hirsute. Flowers numerous (over 30), subsessile, in axillary, globose verticillasters (2-3.5 cm Ø) distributed on distant nodes. Bracts linear-lanceolate, 0.5-1 cm. Calyx tubular, 1-1.2 cm long, in fruit 1.4-1.6 cm, hirsute and woolly outside, 10-toothed; teeth lanceolate, ciliate, with spines-cent tips, the uppermost largest, 5 mm long. Corolla 7-8 mm long, included in the calyx tube or barely exserted; not annulate within; the two lips subequal. Nutlets oblong-obovoid, c. 2 mm long, shining, dark-brown.
An annual herb. It grows to 60 cm high. The stem is square. The leaf stalk is 0.7-1.5 cm long. The leaf blade is oval to sword shaped and 4-6 cm long by 1.5-3 cm wide. The leaves are densely hairy. They have teeth along the edge. The flowers are green and occur in clusters in the axil of each pair of leaves. The small white flowers emerge a few at a time. The fruit are four dark brown, oblong nutlets. Probably now Leonotis martinicensis (Jacq.) J. C. Manning & Goldblatt.
