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Bransford, W.D. and Dolphia
Erysimum capitatum var. purshii
Erysimum capitatum (Douglas ex Hook.) Greene var. purshii (Durand) Rollins
Pursh's wallflower, Alpine Wallflower
Synonym(s): Erysimum amoenum, Erysimum argillosum, Erysimum asperrimum, Erysimum asperum var. amoenum, Erysimum asperum var. purshii, Erysimum capitatum var. amoenum, Erysimum capitatum var. argillosum, Erysimum desertorum, Erysimum nivale
USDA Symbol: ERCAP3
USDA Native Status: L48 (N)
A low plant with several short stems growing from tufts of basal leaves and bearing yellow or yellow-orange flowers with rusty-backed petals in compact racemes.
Western Wallflower (Erysimum capitatum) is one of the Wests most striking wildflowers. It is also one of the most variable species, with very wide ecological tolerance. This variation has defied easy botanical classification; some botanists recognize no varieties, while others attempt to demonstrate the complex variation through nomenclature. The very short alpine phases in the Rocky Mountains were once recognized as a separate species, E. nivale (nivale means of snow and refers to the plants habitat). E. capitatum var. purshii now includes this and numerous other short-stemmed phases of Western Wallflower. The short-stemmed habit, characteristic of many alpine plants, is an adaptation for rapid flower production and protection from the cold.
Bloom InformationBloom Time: Jun , Jul
, WY Native Distribution:
Eastern Utah and Colorado south to central Mexico. Native Habitat:
Dry slopes, rocky ridges, sagebrush flats, aspen and spruce areas, and alpine tundra at moderate to high elevations.
Record Last Modified: 2013-12-03
Research By: TWC Staff