Teucrium bidentatum Hemsl.

Used medicinally.

Herbs erect, perennial. Stems 60-90 cm tall, sparsely retrorse puberulent; branches subhorizontal. Petiole 5-9 mm, puberulent; leaf blade ovate to lanceolate, 4-11 × 1.5-4 cm, glabrous except sparsely puberulent on midrib and veins, abaxially minutely papillate, base cuneate to broadly cuneate-decurrent, margin of apical half 3- or 4-serrate, apex acuminate to caudate-acuminate. Spikes 1.5-4.5 cm, puberulent; verticillasters 2-flowered; bracts ovate-lanceolate, glabrous except ciliate on margin, as long as or longer than pedicel. Pedicel ca. 3 mm, puberulent or subglabrous. Calyx campanulate, swollen in front at base, ca. 4.6 × 4 mm, glabrous except for puberulent base outside, pilose annulate at throat; middle tooth of upper lip oblate, to 3.5 mm wide, lateral teeth subcircular. Corolla white, ca. 1 cm, glabrous; tube slightly exserted, ca. 5 × 1.8 mm; middle lobe of limb subcircular, ca. 3 mm wide, basally constricted; anterior lateral lobes oblong, ca. 1.2 × 0.8 mm; posterior lateral lobes subcircular, ca. 1.2 × 1.5 mm. Stamens ca. 3 × as long as corolla tube. Nutlets yellow-brown, ovoid, ca. 1.2 × 1 mm, netted.

Guangxi, Guizhou, Hubei, Sichuan, Taiwan, Yunnan

* Hilly forests; 1000-1300 m.

Kinostemon bidentatum (Hemsley) Kudo; Plectranthus hanceiformis H. Léveillé; Teucrium bidentatum Hemsley var. purpureum Diels.