Calamintha euosma W. Smith, Notes Roy. Bot. Gard. Edinburgh 9: 89. 1916; Satureja euosma (W. Smith) Kudo.

Subshrubs aromatic, diffuse, tufted. Stems numerous, prostrate-ascending, unbranched, slender, 15-30 cm, basally woody, terete, densely glandular puberulent, purple-red. Petiole 2-4 mm, narrowly winged at apex; leaf blade ovate to subcircular, bractlike toward stem apex, 1-2 × 0.5-1.3 cm, glabrous or midrib puberulent, impressed glandular, base cuneate to rounded, ± decurrent, margin remotely crenulate, apex rounded. Verticillasters (2-)6-10-flowered, 3-7 in narrow terminal panicles; peduncle 5-10 mm; bracts oblong, ca. 5 × 1.5 mm; bracteoles minute, linear. Pedicel 2.5-4 mm. Calyx ca. 5 mm, glandular puberulent, sparsely golden yellow glandular, veins and teeth pilose, throat white pilose, conspicuously 13-veined; teeth narrowly triangular, apex spinescent, subequal, ca. 1.5 mm. Corolla dark red, ca. 1 cm, sparsely puberulent, conspicuously pilose inside; tube ca. 6 mm, slightly exserted; upper lip slightly spreading, suboblong, ca. 1.5 mm, 2-lobed to ca. 1/2 its length; lower lip ca. 5 mm, margin undulate, middle lobe subobcordate, lateral lobes broadly ovate. Ovary glabrous. Nutlets brown, ca. 1 mm, glabrous. Fl. Jun-Aug, fr. Sep-Nov.

* Grassy hillsides, dry valleys in limestone mountains; ca. 3300 m. Yunnan.