Western Wallflower

Here's a closeup of the flowerhead.

Close in on the flowers themselves. Erysimum asperum Brassicaceae (aka Cruciferae) (Mustard family) Common name: Western Wallflower Location: Zion National Park, Kolob Terraces, near Russell Gulch, on open, sunny slopes; April 25, 2008. Elevation: approx 6500 feet NAD83 UTM: 12S 318250 mE 4133900 mN Dominance: Common in the area Comments: Also seen in Escalante, near Egypt, at 5000 ft elevation on 5-12-08 Source: Welsh, Stanley. (1990) Wildflowers of Zion National Park. Zion Natural History Association, Springdale, Utah, USA. ISBN 0-915630-27-3. page 60.