Oenothera xylocarpa

EVENING PRIMROSE

Onagraceae
Evening Primrose family

© Jim Shevock

Perennial.
Gravelly to pumice meadows, Jeffrey-pine or lodgepole-pine/fir forests.
July–August
7200–10200' (2200–3100 m) 
The Jepson Manual p. 804 807