4. Lamium maculatum Linnaeus, Sp. Pl., ed. 2. 2: 809. 1763.
紫花野芝麻 zi hua ye zhi ma
Lamium maculatum var. kansuense C. Y. Wu & Hsuan.
Herbs perennial. Stems 30-50 cm tall, sparsely white pubescent, hollow. Petiole slender, 1.5-3 cm; stem leaf blades ovate, 2.5-5 × 1.5-3 cm, herbaceous, appressed hirtellous, abaxially glandular punctate, base subtruncate to broadly cuneate, margin coarsely incurved serrate, apex caudate-acuminate. Verticillasters 8-12-flowered; bracts linear, 2-3 mm, ciliate. Calyx campanulate, ca. 1 cm × 3.5 mm, 5-ribbed, glabrous except for hirsute veins; teeth subequal, straight or spreading, linear-lanceolate, 5-6 mm, margin ciliate, apex long aristate. Corolla purple, 1.8-2.5 cm; tube ca. 2 mm wide at base, pilose outside, densely so on upper lip, hairy annulate and puberulent inside; upper lip straight, oblong, ca. 7 mm, narrowed and slightly curved at base, margin undulate; lateral lobes of lower lip shallowly semicircular, each with a marginal tooth 1-1.5 mm. Anthers dark purple. Ovary lobes glabrous, with a membranous margin at apex. Fl. Jul-Aug.
Hill tops, valleys; 2400-2700 m. Gansu, Xinjiang [Russia; SW Asia, Europe, North America].