unipetalous

[ yoo-nuh-pet-l-uh s ]
/ ˌyu nəˈpɛt l əs /

adjective Botany.

having only one petal.

Origin of unipetalous

First recorded in 1840–50; uni- + petalous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019