Stems 10-30 cm, appressed puberulent. Leaves opposite; petiole 0.2-5 cm; leaf blade slightly to strongly oblique, elliptic to oblong or ovate to narrowly ovate, 4-18.5 X 2.7-7.6 cm, herbaceous, adaxially puberulent, eglandular, abaxially sparsely puberulent, densely puberulent along veins, eglandular, base oblique, cuneate to rounded, margin denticulate to serrate, apex narrowly to broadly acute; lateral veins 8-11 on each side of midrib. Cymes 5-12-flowered; peduncle 2.3-4.5 cm, sparsely glandular puberulent; bracts free, broadly ovate, ca. 3 mm, glabrous, glandular, margin entire. Pedicel 3-12 mm. Calyx actinomorphic, 5-sect from base; segments equal, lanceolate, 2-2.5 X ca. 1 mm, glabrous, inside glandular, margin entire. Corolla purple-red, 1.6-2.2 cm, glabrous; tube subtubular, 1.2-1.7 cm X ca. 3 mm; adaxial lip ca. 2.5 mm; abaxial lip ca. 7 mm. Filaments ca. 3.5 mm, glabrous; anthers ca. 1.8 mm, glabrous to puberulent; staminodes 2, ca. 1.5 mm. Pistil ca. 1.1 cm, glabrous; ovary ca. 9 mm. Capsule 1.6-2.9 cm. Fl. Jul-Aug, fr. Aug-Dec.
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