A large family, most abundant in the tropics; ours are herbs, usually with twining or trailing stems; the leaves alternate, or mere scales, without stipules; the flowers perfect, with five sepals; the corolla with united petals, more or less funnel-form and more or less five-lobed, folded lengthwise and twisted in the bud; the stamens five, on the base of the corolla; the ovary superior, with from one to three styles; the fruit usually a capsule, with from one to four large seeds.

There are a great many kinds of Convolvulus, widely distributed; ours are mostly twining or prostrate perennials; the flowers large, with a slender style and two stigmas; the fruit a capsule, usually with two large seeds. The name is from the Latin, meaning "to entwine." These plants are often called Bindweed.