Herbs perennial, 10--28 cm tall. Stems often many, ascending to erect, often prostrate at base, ± glandular puberulous. Leaves opposite; petiole narrowly winged by and ca. as long as decurrent leaf blade; leaf blade ovate to oblanceolate or spatulate, 7--12(--20) X 0.6--1.2(--1.6) cm, glabrous, sparsely dark glandular punctate and striate, base attenuate, apex rounded or apiculate. Pedicel 1--1.5 cm, glandular puberulent. Flowers 4 or 5, solitary in axils of upper leaves. Calyx lobes lanceolate, 4--5 mm, dark purple or black glandular striate outside, apex blunt. Corolla pink or white, narrowly campanulate; tube ca. 1.5 mm; lobes obovate-spatulate, 4.5--5.5 mm, with or without few reddish glandular stripes, apex rounded. Stamens slightly shorter than corolla lobes and adnate to lower part; anthers elliptic, dorsifixed, ca. 1 mm. Ovary ovoid; style ca. 4 mm. Capsule subglobose, 3--4 mm in diam. Fl. May-Jun. 2n = 24.
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