[ puh-pil-ee-uh-ney-shuh s ]
/ pəˌpɪl i əˈneɪ ʃəs /

adjective Botany.

having an irregular corolla shaped somewhat like a butterfly, as the pea and other leguminous plants.
belonging to the family Papilionaceae (Fabaceae), that is often included as part of the Leguminosae.

Origin of papilionaceous

1660–70; < Latin pāpiliōn- (stem of pāpiliō) butterfly + -aceous Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for papilionaceous