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Plants herbaceous. Stems prost-rate, climbing, or erect, glabrous. Leaves petiolate (to 1.5 cm) or sessile; blade ovate, lance-elliptic, or spatulate to oblanceolate, (3–)5–9(–15) × (1–)2.5–4(–7) cm, base attenuate, apex acute, acuminate, or obtuse. Inflorescences 3–15(–30) cm, rachises glandular, viscid; floral bracts lanceolate, 3–7 × 1–2 mm. Flowers heterostylous; calyx 7–11(–13) mm, tube glabrous but with stalked glands along length of ribs; corolla white, 17–33 mm, tube 12.5–28 mm (less than 2 times length of calyx), lobes 5–12 × 3–3.5 mm; stamens included. Capsules 7.5–8 mm. Seeds reddish brown to dark brown, 5–6 mm.