papilionaceous

adjective
pa·​pil·​i·​o·​na·​ceous | \pə-ˌpi-lē-ə-ˈnā-shəs \

Definition of papilionaceous 

: having a corolla (as in the bean or pea) with usually five petals that include a large upper petal enclosing two lateral wings and a lower carina of two united petals

First Known Use of papilionaceous

1668, in the meaning defined above

History and Etymology for papilionaceous

Latin papilion-, papilio butterfly — more at pavilion

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The first known use of papilionaceous was in 1668

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