Annual upright herb. Stems 0.3-2 m high, green or purple, obtuse quadrangular, with four grooves, densely villous. Leaves are broadly ovate or round, 7-13 cm long, 4.5-10 cm wide, apex mucrocus or acuminate, base rounded or broadly cuneate, margins coarsely serrated above base, membranous or herbaceous, green on both sides Or purple, or only purple below, sparsely pubescent above, adnate below, lateral veins 7-8 pairs, those located in the lower part are slightly close, ascending obliquely, and the midvein is slightly protruding above, obviously protruding below, slightly paler ; Petiole 3-5 cm long, flat dorsally and ventrally, densely villous.
Cymes 2-flowered, composed of terminal and axillary racemes 1.5-15 cm long, densely villous, biased to one side; bracts broadly oval or nearly round, about 4 mm long and wide, with apex Short acuminate, covered with reddish-brown glandular points, glabrous, margin membranous; pedicel 1.5 mm long, densely pubescent. The calyx is bell-shaped, 10-veined, about 3 mm long, straight, the lower part is villous, with yellow glandular dots, the inner face has a sparsely pilose ring on the throat, when the result increases, grows to 1.1 cm, stretches or droops, One side of the base is swollen, the calyx eaves are two-lipped, the upper lip is broad, 3 teeth, the middle teeth are smaller, the lower lip is slightly longer than the upper lip, 2 teeth, and the teeth are lanceolate. Corolla white to purplish red, 3-4 mm long, slightly puberulent on the outside, slightly puberulent on the inside at the base of the lower lip, short crown tube, 2-2.5 mm long, oblique bell-shaped throat, nearly two eaves Lip-shaped, the upper lip is slightly absent, the lower lip is 3-lobed, the middle lobe is larger, and the lateral lobes are similar to the upper lip. Stamens 4, hardly protruding, anterior pair slightly longer, free, inserted into throat, filaments flat, anthers 2-loculed, loculi parallel, slightly divergent or extremely divergent afterwards; pistil 1, ovary 4-lobed, style Basal implanted, stigma 2-chambered; disc inflated in front; stigma 2-lobed. The calyx is about 10mm long. Style apex equal 2-lobed. The front of the disc is swollen finger-like. Nutlets subglobose, gray-brown, about 1.5 mm in diameter, reticulated. The flowering period is August-November, and the fruiting period is August-December.
