Isodon ternifolius (D. Don) Kudô

Used medicinally.

Plants perennial, robust herbs or shrubs. Stems erect, 0.5-2(-7) m, densely tomentose-villous, much branched. Leaves opposite or in whorls of 3 or 4; petiole 2-3(-10) mm; leaf blade narrowly lanceolate to oblong, rarely ovate-oblong, 2-12 × 0.7-5 cm, papery to ± leathery, corrugate, adaxially pilose to villous, abaxially densely whitish or dull yellow tomentose, base broadly cuneate to cuneate, rarely rounded, apex acute to acuminate, rarely obtuse. Spikes terminal and axillary, compact, 9-35 × 6-10 cm; floral leaves similar to stem leaves, gradually reduced, bractlike apically. Calyx campanulate, ca. 2.3 × 2.5 mm, densely gray or dull yellow villous; teeth triangular, equal, ca. 0.5 mm; fruiting calyx dilated, tubular, ca. 4 mm, obscurely veined. Corolla white to purplish; upper lip purple spotted, 5-6 mm. Stamens and style usually included. Nutlets triquetrous, ovoid, ca. 1.8 × 1 mm, glabrous. Fl. Sep-Feb, fr. Dec-May.

Himalaya (Kashmir to Bhutan), Bengal, India, Burma, S. China.

Guangdong, Guangxi, Guizhou, Yunnan [Bangladesh, India, Myanmar, Nepal, Vietnam]

150-2100 m

Open hills, sparse forests; 100-2200 m.

Plectranthus ternifolius D. Don, Prodr. Fl. Nepal. 117. 1825.

Đẳng nha ba lá (danh pháp khoa học: Isodon ternifolius) là một loài thực vật có hoa trong họ Hoa môi. Loài này được (D.Don) Kudô mô tả khoa học đầu tiên năm 1929.