WordNet sense 1 (vine of tropical Asia having pinnate leaves and bright blue flowers with yellow centers):

blue pea, Clitoria turnatea

WordNet sense 2 (large-flowered wild twining vine of southeastern and central United States having pale blue flowers):

Clitoria mariana

WordNet sense 3 (large-flowered weakly twining or prostrate vine of New Jersey to tropical eastern North America, sometimes cultivated for its purple and white flowers):

Centrosema virginianum