Isodon japonicus (Burm. fil.) H. Hara

Herbs perennial. Stems erect, 40-150 cm tall, base woody, subglabrous, apex pubescent, glandular, much branched. Petioles 1-3.5 cm, pubescent; leaf blades ovate to broadly ovate, (4-)6.5-13 × (2.5-)3-7 cm, papery, pubescent or puberulent, glandular, adaxially dark green, abaxially greenish, base broadly cuneate, abruptly attenuate, margin crenate-serrate, apex acuminate, apical tooth ovate to lanceolate; lateral veins 5-paired, elevated. Panicles loose, patent, terminal; cymes (3-)5-7-flowered, pedunculate, pubescent, glandular; floral leaves ovate, much shorter than cymes, except basal 1 or 2; bracteoles linear, ca. 1 mm. Calyx campanulate, 1.5-2 mm, bluish or densely appressed whitish pubescent outside; teeth triangular, 0.5-0.7 mm, apex acute, lower 2 slightly longer and wider; fruiting calyx tubular-campanulate, to 4 mm, conspicuously veined, slightly curved. Corolla purplish to blue, with dark spots on upper lip, ca. 5 mm. Stamens exserted. Style exserted. Nutlets brownish, triquetrous, ovoid, ca. 1.5 mm, glabrous except apex verruculose. Fl. Jul-Aug, fr. Sep-Oct.

Gansu, Hebei, Heilongjiang, Henan, Jiangsu, Jilin, Liaoning, Shaanxi, Shandong, Shanxi, Sichuan [Japan, Korea, Russia]

Hills, thickets, valleys, forests, forest margins, grasslands; 0-2100 m.

Isodon japonicus là một loài thực vật có hoa trong họ Hoa môi. Loài này được (Burm.f.) H.Hara mô tả khoa học đầu tiên năm 1948.