papilionaceous

/pəˌpɪliəˈneɪʃəs/
adjective
  1. Having a flower shape like a butterfly, with petals arranged in a distinctive way; typical of plants in the pea family (e.g., peas, beans, clover).
    • Botanists classify many garden plants as papilionaceous because of their butterfly-like petals.
    • The papilionaceous blooms of the wisteria vine hung in colorful clusters along the trellis.
    • The sweet pea has a beautiful papilionaceous flower that children love to draw.