Stems 60-100 cm, glabrous. Leaves opposite; petiole 2-5 mm; leaf blade narrowly elliptic to lanceolate or ovate, 2.2-6 X 0.8-2.3 cm, leathery to papery, glabrous, adaxially drying slightly wrinkled, abaxially few punctate, base cuneate to rounded, margin entire, apex long acuminate to caudate; lateral veins indistinct. Cymes axillary, 1-3-flowered; peduncle 2.2-5(-7) cm; bracts usually deciduous, green, linear, 2-6 X 0.8-1 mm. Pedicel 5-11 mm, glabrous. Calyx green, sometimes tinged red, 5-sect from base; segments lanceolate-linear, 3-7 X 0.6-0.8 mm, outside glabrous. Corolla red, 2.5-3.2 cm, outside glabrous, inside glandular puberulent, without tufts of hairs, mouth slightly to strongly oblique; limb indistinctly 2-lipped; adaxial lip erect, 3-4 mm; abaxial lip 3-4 mm. Stamens exserted; filaments ca. 1 cm; anthers coherent in pairs at apex, ca. 1.2 mm; staminode ca. 1.6 mm. Pistil ca. 1.6 cm; ovary glabrous. Style ca. 2 mm, puberulent. Capsule 5.4-8.4 cm. Seeds with 1 hairlike appendage at each end, appendages 0.8-1.2 mm. Fl. Jul-Oct, fr. Oct.
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