CALYSTEGIA, a genus of twining plants of the family Con volvulaceae (q.v.), commonly known as bindweeds and compris ing some 15 or more species, widely distributed in temperate and tropical regions, eight of which are found in California. It differs botanically from Convolvulus in that the calyx is subtended by two large bracts which partly enclose the flower. Well-known rep resentatives are the hedge bindweed (q.v.) ; the seaside bindweed or shore morning-glory (C. Soldanella), widespread along coasts, including those of the British Isles, California and the Pacific ocean generally ; and the Japanese bindweed or California-rose (C. japonica), native to eastern Asia, grown for ornament, and somewhat naturalized in the eastern U.S. By many botanists, especially in the U.S., Calystegia is made a part of Convolvulus and in standard American floras and horticultural works the fore going and other species are described under the last named genus.