Ipomoea batatas

Ipomoea batatas - Vines; the stem usually somewhat succulent but sometimes slender and herbaceous; perennial, glabrous or pubescent. Leaves variable, from cordate, ovte, 5-10ncm long, glabrous or pubescent. Inflorescences of solitary flowers or in few flowered cymes, glabrous. Flowers absent in some varieties, if present on pedicels 3-12 m long; corolla with a lavender to purple-lavender, 4-7 cm long. Fruit rarely formed, ovoid, glabrous.