Isodon adenanthus (Diels) Kudô

Used medicinally for dysentery and enterogastritis.

Herbs perennial. Stems numerous, ascending, 15-40 cm, few branched, densely retrorse gray pubescent. Petiole of mid stem leaves 2-10 mm; leaf blades largest, rhombic-ovate to ovate-lanceolate, (1.5-)2.5-3.5(-6.5) × (1-)1.5-2.5 cm, thin papery, scattered and yellowish glandular, abaxially white pilose, densely white pubescent on veins, base broadly cuneate-decurrent, apex obtuse. Cymes pedunculate, 3-5-flowered, in terminal spikelike panicles 10-20 cm, densely pubescent; floral leaves mostly bractlike, lanceolate, ± entire. Calyx purple, broadly campanulate, 2-3 mm, scattered yellowish glandular, pilose on veins, 2-lipped; teeth ovate-lanceolate, 1-1.5 mm, apiculate at apex, lower 2 slightly larger; fruiting calyx projected, conspicuously 2-lipped, dilated to 4 mm. Corolla blue, purple, pink, or white, densely pubescent except for upper side near base, yellowish glandular, tube ca. 4 mm, upper lip ca. 4 mm, lower lip to 6 mm. Stamens included. Style included. Nutlets brown, ovoid, ca. 1.5 mm in diam. Fl. Jul-Aug, fr. Jul-Sep.

Guizhou, Sichuan, Yunnan

* Pine forests, grasslands; 1100-3400 m.

Plectranthus adenanthus Diels, Notes Roy. Bot. Gard. Edinburgh 5: 228. 1912; P. wui Sun ex C. H. Hu; Rabdosia adenantha (Diels) H. Hara.