Description from Flora of China
Phlomis zeylanica Linnaeus, Sp. Pl. 2: 586. 1753.
Herbs erect, ca. 40 cm tall. Stems hispid-villous or villous-hirsute. Petiole ca. 5 mm; leaf blade oblong-lanceolate, 3.5-5 × 0.5-1 cm, sparsely strigose, densely so on veins and densely yellowish glandular abaxially, base cuneate-attenuate, margin remotely crenate-serrate above base, apex acuminate, lateral veins 3 or 4 pairs. Verticillasters ca. 1.5 cm in diam., subequal, few flowered, sparsely hispid; bracts linear, mostly shorter than calyx tube, apex somewhat spinescent. Calyx tubular-campanulate, slightly curved, basally glabrous, slightly corrugate, sparsely hispid at apex outside, minutely hispid inside, veins inconspicuous, not hispid; mouth oblique, slightly constricted; teeth 8 or 9, spinescent, ca. 1 mm. Corolla white or white with purple spots, ca. 1.2 mm; tube slender, straight, slightly enlarged, densely villous near throat, subglabrous at base outside, villous annulate inside; lower lip ca. 2 × as long as upper lip, spreading, lateral lobes ovate; middle lobe largest, elliptic, undulate on margin. Nutlets chestnut brown, ellipsoid, subtriquetrous, shiny. Fl. and fr. year round.
Used medicinally for coughs, toothaches, and abdominal pains.
Seashores, fields, roadsides, sunny waste slopes; 0-300 m. Guangdong, Guangxi, Hainan [India, Indonesia, Malaysia, Myanmar, Philippines, Sri Lanka]