Description from Flora of China
Ocimum inflexum Thunberg, Syst. Veg., ed. 14, 546. 1784; Plectranthus inflexus (Thunberg) Vahl ex Bentham var. canescens Nakai; P. inflexus var. macrophyllus Maximowicz.
Herbs perennial. Stems flexuous, erect, 40-100(-150) cm tall, much branched basally, densely retrorse white pilose along angles. Petiole 0.5-3.5 cm, densely white pilose; leaf blade broadly triangular-ovate to ovate, 3-5.5 × 2.5-5 cm, papery, adaxially olive green, sparsely puberulent, abaxially greenish, whitish pilose along veins, base broadly cuneate, abruptly attenuate-decurrent, margin coarsely crenate-serrate above base, apex acute to obtuse; lateral veins ca. 4-paired, slightly impressed adaxially, elevated abaxially. Panicles narrow, 6-10 cm; cymes 3-5-flowered, pedunculate, terminal and axillary; floral leaves subsessile, ovate, margin remotely serrate or subentire. Calyx campanulate, ca. 2 mm, pubescent outside, glabrescent; fruiting calyx slightly dilated, to 5 mm, conspicuously veined. Corolla reddish to purplish, ca. 8 mm, puberulent outside, sparsely glandular; tube ca. 3.5 mm. Stamens included. Style included. Nutlets brownish, broadly ovoid, ca. 1.5 mm, glabrous. Fl. Aug-Oct, fr. Oct.
Sparse valley forests, streamsides, hills, sunny areas; 200-1400 m. Hebei, Hubei, Hunan, Jiangsu, Jiangxi, Jilin, Liaoning, Shandong, Zhejiang [Japan, Korea].