20. Ipomoea nil (Linnaeus) Roth, Catal. Bot. 1: 36. 1797.
[I W]
Japanese morning glory
Convolvulus nil Linnaeus, Sp. Pl. ed. 2, 1: 219. 1762; Pharbitis hederacea (Linnaeus) Choisy; P. nil (Linnaeus) Choisy
Annuals. Stems twining. Leaf blades cordate, ± orbiculate, ovate, or 3-lobed, 50–150 × 20–140 mm overall, base cordate, surfaces sparsely hirsute to sericeous. Peduncles hairy, hairs retrorse. Flowers: sepals lance-linear, 15–25(–30) mm, herbaceous, proximally narrowly ovate, densely hispid, gradually narrowed to ± straight, hispid to strigose or glabrate distal portion longer than ovate base; corolla usually blue to purplish, sometimes red or white, tube white or yellow inside, funnelform, (20–)30–60+ mm. 2n = 30.
Flowering Jul–Dec. Abandoned plantings, fields, thickets; 10–2200 m; introduced; Ala., Ky., La., Md., Miss., N.C., Okla., S.C., Tenn., Tex.; Mexico; West Indies; Central America; South America; introduced also in Asia.
Reports of Ipomoea nil from California are based on misidentified material of I. hederacea.
