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Leaf lamina, linear, lanceolate to ovate, 3–10 × 0·15–4 cm., entire, membranous, acute or obtuse at the apex, cuneate or cordate at the base; glabrescent or hispidulous along the margins; petiole 2–15 mm. long, hairy.
Flowers usually solitary, rarely paired, fading early in the morning; peduncle 0.3–2 cm., long, glabrescent; bracteoles up to 3 mm. long, subulate.
Corolla funnel-shaped, crimson, rose or mauve or limb white and tube coloured, 5–7·5 cm. long; tube rather dilated in middle.
Sepals ovate or orbicular, 6–8 mm. long, obtuse, with reddish papillae, more rarely almost smooth, hairy or glabrescent.
Flowers 2-2 1/2 in. long and as much across the limb, pale, almost white, or reddish-purple darker throat and tube.
Perennial herb often tinged purplish, with a tuberous root-stock fusiform or globose, lactiferous.
Stems very slender, twining or prostrate up to 1 m. long, often clothed with fine spreading hairs.
Stems twining, very slender, pilose at first, becoming glabrous;
Seeds black or pale brown, ovoid, shortly pubescent.
Capsule globose, glabrous.