Plants perennial. Stems erect, 1-1.25 m. Petiole as long as to longer than blades, densely pubescent; leaf blade triangular-ovate, sparsely villous or glabrous, appressed hairy on veins, base hastate-sagittate. Inflorescences densely glandular pubescent; verticillasters 6-flowered, widely spaced, 10-12 in terminal racemes or panicles; bracts sessile, ovate to elliptic, shorter than calyx, reflexed, abaxially fine pubescent, glandular hairy, apex long acuminate; lower bracts smaller than stem leaves, 2-4 cm. Pedicel 5-6 mm. Calyx 1-1.2 cm, pubescent, long glandular hairy, minutely hispid inside, sparsely hairy at base; upper lip semicircular, shorter than lower, apex short 3-dentate; lower lip deeply 2-toothed. Corolla yellow with brown markings on lower lip, finely striate or spotted on limb, 3-4 cm; tube exserted, glandular hairy outside, finely hairy inside; upper lip falcate, glandular pubescent; middle lobe of lower lip broadly obovate, slightly shorter than lateral lobes, margin revolute, strongly dentate; lateral lobes transversely elliptic-oblong, revolute. Filaments shorter than connectives, upper arms 2-3 × as long as lower arms; upper anther cells to 1 cm, lower cells deformed, semicircular, united. Nutlets brown, black reticulate, ellipsoid, ca. 3 mm, Fl. Jun-Aug (specimens not seen).
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A herb. It grows about 75 cm high. It has sticky hairs. The leaves have stalks. The leaves are 1.5-11.5 cm long by 1.3-6 cm wide. They are oval and taper to the tip. They have teeth around the edge and the base joins at right angles to the leaf stalk. The leaf bases are long and tapering. The flowers are yellow and in large spreading clusters. The nutlets are about 3 mm across.
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