Isodon rugosiformis (Hand.-Mazz.) H. Hara

Subshrubs 0.8-1.2 m. Stems wandlike, much branched; branches ± glabrescent; branchlets yellowish brown, densely gray tomentulose. Petiole 3-15 mm; leaf blade rhombic to triangular-ovate, 1.5-4 × 1-2.5 cm, thin papery, glandular, adaxially dark green, densely gray puberulent mainly on veins, abaxially densely gray tomentulose, base broadly cuneate to truncate, margin crenate, apex acute to short caudate-acuminate; lateral veins ca. 4-paired. Panicles spikelike, terminal, densely gray tomentulose; cymes contiguous, pedunculate, sometimes compact, 3-5-flowered; floral leaves ovate-lanceolate, 0.5-1.5 cm, margin subentire. Pedicel 2-3 mm. Calyx campanulate, to ca. 3 mm, gray tomentulose outside, slightly 2-lipped; teeth ovate-triangular, subequal, ca. 1/2 long as calyx, lower 2 slightly longer; fruiting calyx slightly dilated. Corolla purple or purplish blue, ca. 7 mm, puberulent, upper lip ca. 2 mm, lower lip ca. 4 mm. Stamens (at least upper) slightly exserted. Style exserted. Nutlets brown, triquetrous, ellipsoid, ca. 1.3 mm, glabrous. Fl. and fr. Sep-Oct.

Yunnan.

* Thickets on hilly slopes, valleys, rocky areas; 1900-2500 m.

Plectranthus rugosiformis Handel-Mazzetti, Kaiserl. Akad. Wiss. Wien. Math.-Naturwiss. Kl., Anz. 62: 237. 1925; Rabdosia rugosiformis (Handel-Mazzetti) H. Hara.