Herbs perennial. Rhizomes tuberous, with red buds. Stems 30-70 cm tall, mostly unbranched, whitish puberulent, villous. Stem leaves opposite, sessile; leaf blade narrowly to broadly ovate, 2.5-6 × 1.4-3.8 cm, adaxially olive green, strigose, abaxially greenish, densely purplish glandular, scaly hirsute especially on veins, base cuneate to attenuate, margin crenate, apex acute, occasionally obtuse. Panicles terminal or axillary, 7-34 cm; cymes 5-15-flowered, divaricate, pedunculate, papillose velutinous; floral leaves bractlike except basal leaves, triangular to lanceolate, 2-3 mm, entire; bracteoles minute, narrowly lanceolate to linear, 1-2 mm. Calyx campanulate, ca. 2.8 mm, ca. 2.8 mm in diam. at mouth, puberulent outside, red glandular; teeth slightly shorter than calyx tube, broadly ovate, lower 2 larger; fruiting calyx to 5 mm, nodding, recurved at throat, teeth much shorter than calyx tube. Corolla yellowish or whitish, dark or red-purple on upper lip, with purple spots on lower lip, 4-5 mm, tube a slightly longer than calyx. Stamens exserted. Style exserted. Nutlets dark brown, compressed ovoid, ca. 1.2 × 0.8 mm, glabrous. Fl. and fr. Aug-Oct.
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