Chylismia walkeri ssp. tortilis (Jeps.) W.L. Wagner & Hoch  

Family: Onagraceae

Walker's suncup, more...Walker's suncup

[Camissonia walkeri ssp. tortilis (Jeps.) P.H. Raven, moreOenothera scapoidea var. tortilis Jeps., Oenothera walkeri ssp. tortilis (Jeps.) P.H. Raven]