13. Ipomoea violacea Linnaeus, Sp. Pl. 1: 161. 1753.
Beach moonflower
Calonyction tuba (Schlechtendal) Colla; Ipomoea tuba (Schlechtendal) G. Don
Perennials or lianas. Stems twining, not setose. Leaf blades usually cordate, orbiculate, or ovate, sometimes 3-lobed, 50–160 × 40–150 mm overall, base cordate, surfaces glabrous. Peduncles hairy, hairs retrorse to spreading. Flowers nocturnal; sepals orbiculate or ovate, 15–25 mm, herbaceous, apex emarginate, obtuse, or truncate, abaxial surfaces glabrous or proximally sparsely hirsute; corolla white, limb with yellowish lines, salverform, 50–120 mm. 2n = 30.
Flowering year-round. Dunes, littoral, mangrove sites; 0–50 m; Fla., Tex.; Mexico; West Indies; Central America; South America; introduced in Asia, Australia.
The name Ipomoea violacea has been misapplied to plants of I. tricolor.