狭齿水苏 xia chi shui su

Herbs perennial. Rhizomes enlarged. Stems ascending-erect, 50-100 cm, densely retrorse pilose. Petiole 1.5-2.5 cm; stem leaf blade ovate-cordate, 5-7 × 2.8-4 cm, membranous, adaxially densely silky-strigose; abaxially densely strigose, densely pilose on veins, base cordate, margin crenulate-serrate, apex acuminate. Verticillasters 2-6-flowered, widely spaced; upper floral leaves sessile, lanceolate, base rounded, shorter than flowers; bracteoles linear, less than 1 mm. Pedicel ca. 1 mm. Calyx tubular-campanulate, 6.5-7 mm, densely pilose, glandular, ± conspicuously 10-veined, inside silky-puberulent; teeth subequal, linear-lanceolate, 2.5-3 mm, apex acuminate, reflexed. Corolla purple or red, ca. 1.5 cm; tube cylindric, saccate, apex puberulent; upper lip straight, oblong-ovate, ca. 4 × 2.5 mm; lower lip horizontally spreading, ca. 5 mm wide; middle lobe largest, subcircular, ca. 3 mm wide; lateral lobes ovate, ca. 1.5 mm wide. Stamens included; filaments puberulent, apex slightly dilated. Ovary brown, glabrous. Fl. Jul-Aug.

* Bamboo forests; ca. 800 m. Hubei, Sichuan.