Centrosema virginianum

Common Name:  Butterfly-pea

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flower--in Centrosema, the flower is upside down compared to other papilionoid legumes.  Do you see how the banner petal is the lowermost petal? flower from the side, showing the two wing petals
leaf--what kind of leaf complexity is present here?  Also, notice that Centrosema is a vine that has twirling stems.