块根小野芝麻 kuai gen xiao ye zhi ma

Leonurus tuberiferus Makino, Bot. Mag. (Tokyo) 19: 146. 1905; Lamium chinense Bentham var.? parvifolia Hemsley; Lamium kelungense Hayata; Lamium tuberiferum (Makino) Ohwi; Matsumurella tuberifera (Makino) Makino.

Herbs perennial. Taproot forming a globose or oblong tuber at apex. Stems 10-20 cm tall, slender, minutely hispid. Petiole 0.5-1.5 cm; stem leaf blades ovate-rhombic, 1-2 × 0.8-1.6 cm, herbaceous, adaxially appressed white ciliate, abaxially appressed hirsute, base broadly cuneate, margin crenate-serrate, apex acute or obtuse. Verticillasters (2-)4-8-flowered; floral leaves similar to stem leaves, 5-6 × 3-4 mm; bracts linear, ca. 3 mm. Calyx tubular-campanulate, ca. 8 × 2.2 mm, bristly; teeth triangular-lanceolate, as long as calyx tube, apex acuminate. Corolla purple-red or reddish, ca. 1.3 cm; tube ca. 0.6 mm wide at base, ca. 4 mm wide at throat; upper lip straight, oblong, ca. 6 mm, hispid outside; lower lip 8 × 5 mm, purple spotted, middle lobe obcordate, lateral lobes subcircular. Anthers dark purple. Ovary lobes oblong, scaly at apex. Nutlets brown, triquetrous, obovoid, ca. 2 × 1 mm, truncate, glabrous. Fl. Apr, fr. May.

Wet sites close to villages, foothills; ca. 300 m. Guangxi, Hunan, Jiangxi, Taiwan [Japan].