Isodon amethystoides (Benth.) H. Hara

Used medicinally.

Herbs erect, perennial. Stems 30-150 cm tall, densely appressed incurved-pilose or puberulent, axillary branchlets sterile. Petiole 0.2-2.5 cm; leaf blade ovate-orbicular to lanceolate, 0.8-11 × 0.7-3.5 cm, thin papery, adaxially olive green, ± densely hispidulous, sometimes subglabrous, abaxially greenish, pilose or tomentulose, sometimes subglabrous, base abruptly attenuate or broadly cuneate-attenuate, margin crenate except for entire base, apex acuminate to obtuse. Panicles terminal; cymes loose, many flowered, 2-9 × 1.5-8 cm, with divaricate elongated branchlets; floral leaves ovate, similar to stem leaves, smaller. Calyx campanulate, ca. 2.5 × 2.5 mm, sparsely hirtellous or subglabrous outside, with scattered white or yellow glands; teeth 5, subequal, triangular, ca. 1/3 as long as calyx; fruiting calyx erect, broadly campanulate, 4-5 × ca. 5 mm. Corolla white bluish, white, or purplish, purple bluish on upper lip, ca. 7 mm, sparsely puberulent outside. Stamens included. Style included. Nutlets ovoid, ca. 2 mm, brown to yellow or white glandular. Fl. Jun-Oct, fr. Sep-Nov.

Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hubei, Jiangxi, Taiwan, Zhejiang

* Forests, wet grassy areas; 200-900 m.

Plectranthus amethystoides Bentham, Labiat. Gen. Spec. 45. 1832; P. daitonensis Hayata.