Stems 25-150 cm, glabrous. Leaves opposite; petiole 5-20 mm; leaf blade broadly lanceolate to elliptic, ovate, or obovate, 4.4-13 X 1.5-6.1 cm, leathery to papery, glabrous, adaxially drying wrinkled or smooth, abaxially few punctate, base cuneate to rounded or subcordate, margin entire to shallowly dentate, frequently undulate, sometimes revolute, apex caudate to acuminate; lateral veins indistinct. Cymes axillary or pseudoterminal, 2-7-flowered; peduncle (0.5-)3-7 cm; bracts usually persistent, red to purple, lanceolate to ovate, 1.5-3 X 0.6-1.4 cm. Pedicel 6-12(-20) mm, glabrous. Calyx red, 5-sect from base; segments linear to lanceolate, 1.2-1.9 cm X 2-4 mm, outside glabrous. Corolla red to pink or purple, 3.2-4.2 cm, glabrous, mouth strongly oblique; limb indistinctly 2-lipped; adaxial lip erect, 6-8 mm; abaxial lip reflexed, 6-8 mm. Stamens exserted; filaments ca. 2.5 cm; anthers coherent in pairs at apex, 1.8-2.5 mm; staminode ca. 0.5 mm. Pistil ca. 2.8 cm; ovary glandular puberulent. Style 4-6 mm, glandular puberulent. Capsule 7-16(-21) cm. Seeds with 1 hairlike appendage at each end, appendages 1.8-3 mm. Fl. Jun-Oct, fr. Jul-Jan.
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