Camissonia pterosperma
Wing-seeded Evening-primrose

Illustration by Bobbi Angell. Reprinted with permission from Intermountain Flora: Vascular plants of the Intermountain West, U.S.A., by A. Cronquist, N. H. Holmgren, and P. K. Holmgren, Vol. 3A Subclass Rosidae (except Fabales), p. 187, copyright 1997, The New York Botanical Garden.