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| Erysimum capitatum (Dougl. ex Hook.) Greene |
Erysimum capitatum is a species of wallflower known commonly as the sanddune wallflower, western wallflower, or prairie rocket. It is a mustard-like plant with thin, erect stems growing from a basal rosette and topped with dense bunches of bright golden, yellow, or tangerine colored flowers, each with four flat petals. Seed pods extend straight out from the stem. Although quite variable in appearance, it is an attractive garden plant.
There are several natural variants of this plant. Each is treated separately, with certain variants considered endangered species in some areas. For example Erysimum capitatum var angustatum, the Contra Costa wallflower, is an endangered plant in the state of California.
Subspecies
- E. c. var. angustatum - Contra Costa wallflower
- E. c. var. bealianum
- E. c. var. capitatum - Western wallflower
- E. c. var. lompocense - San Luis Obispo wallflower
- E. c. var. perenne
- E. c. var. purshii - Pursh's wallflower
This species can be found across North America, but some variants have an extremely narrow distribution, especially in California. E. capitatum capitatum is widely distributed all over along Utah, where it flowers from May to July (see Utah Valley State College Herbarium webpage)
Ecology
No much information on its relationship with pollinators exists for this wallflower species. Dr Andrew Moldenke studied a population of Erysimum capitatum var. perenne during 1968-1970 in Timberland Hall Area- Subalpine Talus Fell Scree (2900-3500 m elevation). This author observed 13 species of flower visitors, although over 80% of the visits to their flowers were performed by two ant species, Formica lasioides and one from the Formica fusca group.
External links
- USDA Plants Profile
- Photos and species account
- Jepson Manual Treatment
- Photo gallery
- Utah Valley State College Herbarium
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