Perennials, 10-30 cm tall. Stems slender, ascending, simple, entirely villous with multicellular hairs or hairs only along 2 lines. Leaves 4 or 5 pairs, evenly distributed; petiole 3-7 mm, upper ones shorter; lower leaf blades small, ovate, base rounded-obtuse; upper ones narrowly ovate to ovate-lanceolate, 2-3 X 1-1.5 cm, base rounded; all leaf blades glabrous or adaxially sparsely hairy, margin with 4 or more deep incised teeth, teeth curved toward leaf apex, apex acute to acuminate. Racemes (1 or)2(or 3), axillary in upper leaves, ca. 2 cm, to 8 cm in fruit, lax, 2-10-flowered, axis and pedicels with dense multicellular glandular hairs; peduncle 0.5-2 cm; bracts linear, 3-4 mm, subglabrous. Pedicel straight. Calyx 4-lobed; lobes narrowly elliptic to oblanceolate, ca. 3 mm, subequal, ciliate with multicellular glandular hairs. Corolla pink, rotate, ca. 1.1 cm in diam.; tube less than 1.5 mm; throat villous; lower lobe obovate, other 3 obovate-orbicular. Stamens much shorter than corolla. Capsule pliciform-rhomboid, strongly compressed, 4-5 X 8-10 mm, base angle slightly larger than 120°, margin apically glandular ciliate, emarginate. Style ca. 3 mm. Seeds 2-10 per locule, ovoid, flattened, slightly convex, ca. 0.6 mm. Fl. Jun-Aug.
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