butterfly pea

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several plants of the genera Centrosema and Clitoria in the pea family, having blue or lavender flowers and flat pods.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun vine of tropical Asia having pinnate leaves and bright blue flowers with yellow centers
• noun large-flowered weakly twining or prostrate vine of New Jersey to tropical eastern North America, sometimes cultivated for its purple and white flowers
• noun large-flowered wild twining vine of southeastern and central United States having pale blue flowers