Convolvulus (Lat. convolvere, to entwine), or Bindweed, an extensive genus of twining plants, annual and perennial. Most of its species have large and bright flowers, opening early in the morning, but entirely closed later in the day. The distinguishing characteristics are the funnel-shaped corolla, naked and bract-less calyx, and two linear stigmas of its flowers; and its two-celled seed capsules, each cell of which contains two seeds. The more important species are the C. Japonicus, or Japanese convolvulus, one of the brightest and most ornamental of the kinds seen in our gardens; the 0. scammonia, from the root of which the drug scammony is extracted; the C. batatas, which has an edible root, and in the reign of Queen Elizabeth was exported from the West Indies to England, and sold as an article of food, filling somewhat the place of the potato, then scarcely known; and the C. Mau-ritanicus, a beautiful dwarf trailing species.