Oenothera cespitosa Nutt. var. marginata (Nutt. ex Hook. & Arn.) MunzMay 22, 2010, late afternoon, Salt Lake County foothills, Wasatch Mtns, approx 5000 ft.Leaves on this plant less pinnatifid than others but growing directly with the typical var. marginata type plants.The species name has been widely spelled as "caespitosa" however that appears to be in error going back to the early 1800's. The name as published by Nuttall was cespitosa, not caespitosa, and that spelling does not contain any obvious error requiring correction, so the originally published name should be used.