Stems 11-15(-30) cm, densely pubescent. Leaves opposite; petiole 0.2-2.5(-5) cm; leaf blade slightly oblique, narrowly ovate to elliptic, 4.5-10.5 X 2-5.5 cm, papery, adaxially densely appressed puberulent, eglandular, abaxially densely puberulent along veins, eglandular, base broadly cuneate, margin denticulate to serrate, apex acute to acuminate; lateral veins 6-9 on each side of midrib. Cymes 1-5-flowered; peduncle 4.5-7 cm, glandular puberulent; bracts free, orbicular-ovate, 5-7 mm, glabrous to sparsely pubescent, margin entire. Pedicel 3-7 mm. Calyx slightly zygomorphic, 9-10 mm; limb indistinctly 2-lipped; tube ca. 8 mm; adaxial lip 3-lobed, depressed trapeziform, 1.5-2 mm, lobes broadly ovate, ca. 1.8 mm wide; abaxial lip 2-parted, depressed trapeziform, ca. 2 mm, lobes broadly ovate, ca. 2.5 mm wide, outside glabrous, inside minutely puberulent below middle, margin entire. Corolla purple, ca. 3 cm, glabrous; tube cylindric, ca. 2 cm X 3-4 mm; adaxial lip ca. 4 mm; abaxial lip ca. 1 cm. Stamens glabrous; filaments ca. 5 mm; anthers ca. 2 mm; staminodes 3, ca. 2.2 mm. Pistil ca. 2 cm, glabrous, minutely glandular; ovary ca. 1.8 cm. Capsule ca. 4 cm. Fl. Jun-Jul.
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