Stems: Several from a woody rootstock, erect to semidecumbent, branched, internodes 10 mm-70 mm long, lower part of stem terete, densely pilose, upper part square in section, grooved, sparsely pilose. Leaves: Opposite, simple, erect, shortly petiolate, blade ovate-lanceolate or elliptic, but some lower leaves almost orbicular, 10 mm-27 mm x 9 mm-13 mm, obtuse to acute, margins mostly entire, sometimes minutely toothed distally, base shortly attenuate, venation reticulate, upper and lower surfaces pilose, with mixture of dark red and prominent golden glands, petiole 2 mm-6 mm long, stipules 0. Inflorescence: Terminal, a lax panicle with lateral branches, 45 mm-100 mm diameter, peduncle sparsely pilose, bracts sessile, lower ones persistent, upper caducous, boat-shaped, elliptic-lanceolate, 5 mm-18 mm x 1 mm-5 mm, pilose and gland-dotted, margin entire; verticillasters 2-flowered, internodes 5 mm-19 mm apart, pedicel 1 mm long. Flowers: Calyx 7 mm long, with tube 5 mm long, gland-dotted and strigose, mainly on veins, with some glandular hairs, inner surface pubescent, lobes 5, tooth-like, 2 mm long, unequal, pilose; corolla white, 13 mm-19 mm long, tube 9 mm-11 mm long, glabrous, abaxial lip 4 mm-6 mm long, sparsely ciliate, adaxial lip erect, 1.0 mm-2.5 mm long with purple blotch apically, pubescent and gland-dotted. Stamens: Exserted by 12 mm, anthers orange. Style: Exserted by 10 mm, bifid. Nutlets: Two per calyx, oblong, 2.5 mm-3.0 mm x 1.5 mm-2.0 mm, smooth, shiny, greenish brown with single dark vein on outer surface from base and with frill-like extensions at base.
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