Ipomoea is a genus in the Convolvulaceae family with species that are perennials and annuals that are found in North and South America, West Indies, Hawaii, Asia, and South Africa. The popular Sweet Potato, Ipomoea batatas, is a common garden plant in the United States, as is the Cardinal Climber, Ipomoea x multifida, which is a hybrid of I. quamoclit and I. coccinea.
Ipomoea fistulosa (name uncertain, perhaps I. platensis) summer growing winter dormant twiner several meters long forming a massive tuber, blooming for months. Full sun, much water, do not overfertilize as it will grow lush on the expense of flowers. Not frost hardy but excellent in containers. Propagates easily from cuttings which should not be given a dormancy in their first winter as they may not yet have formed a tuber. Best grown outside in summer as it suffers from spider mite under glass, otherwise pest free, easy and rewarding. Information and pictures from Johannes-Ulrich Urban.
Ipomoea longifolia is native from southern Arizona through northern and central Mexico. The thick stems tend to trail along the ground rather than twine, and the flowers bloom at night. Photos taken August 2008 in southeast Arizona by Eugene Zielinski.
Ipomoea pandurata is a species native to eastern North America. It is a perennial wild flower with large showy white flowers with purple centers. The flowers open in morning and wither in the heat of afternoon summer sun. The seeds are distinctive in having a ring of fur similar to a lion's mane. The second photo shows seeds that were lethally damaged by an insect. Photos by Dennis Kramb.