Isodon forrestii (Diels) Kudô

Herbs perennial. Stems numerous, 60-100(-180) cm tall, robust, pilose. Petiole ca. 5 mm, densely pilose; leaf blade ovate to rhombic-ovate, 5-10 × 4-7 cm, papery, densely pilose, sparsely yellowish glandular, adaxially olive green, abaxially greenish, base broadly cuneate-decurrent, margin crenate-dentate except for entire base, apex obtuse to acute; lateral veins 4-paired, conspicuously elevated. Panicles patent, to 30 × 8-9 cm; cymes 7-11-flowered, pedunculate, densely glandular pubescent; floral leaves bractlike, ovate, 5-7 mm; bracteoles spatulate, 2-3 mm, ciliate. Pedicel 2-7 mm. Calyx dark purple-red, broadly campanulate, 4-5 mm, pubescent on veins outside otherwise yellowish glandular, slightly 2-lipped; teeth ovate-lanceolate, apex acuminate; fruiting calyx dilated, 7-8 mm, conspicuously veined. Corolla dark blue, bluish, or reddish, to 1.6 cm, pilose outside especially basally; tube ca. 1 cm. Stamens included. Style included. Nutlets yellow-brown, ovoid, ca. 1.8 × 1.5 mm. Fl. Jul-Aug, fr. Aug-Sep.

Sichuan, Yunnan.

* Stony grasslands, forest margins, grassy openings in pine forests; 2600-3500 m.

Plectranthus forrestii Diels, Notes Roy. Bot. Gard. Edinburgh 5: 229. 1912; Rabdosia forrestii (Diels) H. Hara; R. forrestii var. intermedia C. Y. Wu & H. W. Li.