Isodon walkeri (Arn.) H. Hara

Herbs perennial. Stems 40-60 cm tall, repent at base, ascending, unbranched or branched, puberulent or scaly pilose. Stem leaves opposite; petiole 2-12 mm; leaf blade narrowly lanceolate or lanceolate to elliptic-lanceolate, 2.4-7.5 × 0.6-2.1 cm, papery, adaxially olive green, glabrous, scaly hispidulous on veins, abaxially greenish, subglabrous, sparsely brown glandular, base narrowly cuneate, margin ± remotely serrate above middle, apex acuminate. Panicles terminal, 4-30 × 2.5-6 cm; cymes 3-15-flowered, pedunculate, scaly pilose; floral leaves bractlike, ovate to lanceolate; bracteoles minute, linear, ca. 1 mm. Calyx campanulate, ca. 2 × 1.6 mm, conspicuously 10-veined, brown glandular, subglabrous or scaly pilose on veins, slightly 2-lipped; teeth ovate, lower 2 a little longer; fruiting calyx ca. 3 × 1.1 mm, lower lip much longer than upper. Corolla rose or white, 6-7 mm, tube 3-3.5 mm. Stamens and style much exserted. Nutlets ovoid, slightly compressed. Fl. Nov-Jan, fr. Dec-Jan.

Guangdong, Guangxi, Yunnan [India, Laos, Myanmar, Sri Lanka].

Streambanks, wet areas in forests; 300-1300 m.

Plectranthus walkeri Arnott, Pug. Pl. Ind. Or. 36. 1836; Isodon stracheyi (Bentham ex J. D. Hooker) Kudo; P. brandisii Prain; P. stracheyi Bentham ex J. D. Hooker; P. veronicifolius Hance; Rabdosia stracheyi (Bentham ex J. D. Hooker) H. Hara.

Isodon walkeri là một loài thực vật có hoa trong họ Hoa môi. Loài này được (Arn.) H.Hara mô tả khoa học đầu tiên năm 1985.