E-Flora BC: Electronic Atlas of the Flora of British Columbia

Erysimum asperum (Nutt.) DC.
prairie rocket (western wallflower)
Brassicaceae (Mustard family)

Introduction to Vascular Plants

© Virginia Skilton  Email the photographer   (Photo ID #18047)

E-Flora BC Static Map
Distribution of Erysimum asperum
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Species Information

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Biennial herb from a simple or sometimes branched stem-base; stems erect, stout, 5-45 cm tall, simple or branched above, ash grey with a close hairiness.
Basal leaves thick, firm, numerous, more or less in a rosette, oblanceolate, wavy-toothed, stalked, 3-10 cm long, (2) 4-13 (25) mm wide, sharp-pointed at the tips, densely grey-hairy mainly with 2-rayed hairs; stem leaves narrowly lanceolate, entire to somewhat toothed.
Racemes bractless, 4-40 cm long; flower stalks 5-15 (20) mm long, stiffly erect or spreading; petals bright yellow to deep orange or somewhat reddish, 13-32 mm long, blades 4-8 (9) mm wide; sepals (6) 8-13 mm long, outer ones with a pouch at the base.
Siliques, (3) 5-11 (14) cm long, 1.3-2.7 mm wide, round in cross section to flattened; beaks 1-5 mm long, beak-like; seeds 1.5-2.3 mm long, wingless or slightly wing-margined at tip.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry roadsides and rocky slopes in the montane zone; rare in SE BC; E to S MB and S to KS, MN, NM and N CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Erysimum asperum

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 915 915 915
Slope Gradient (%) 55 55 55
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
183 183 183
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 2
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: ICH(1)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Cheirinia aspera (Nutt.) Britt.
Erysimum amoenum (Greene) Rydb.
Erysimum argillosum (Greene) Rydb.
Erysimum arkansanum Nutt.
Erysimum asperrimum (Greene) Rydb.
Erysimum asperum var. amoenum (Greene) Reveal
Erysimum asperum var. angustatum (Rydb.) B. Boivin
Erysimum asperum var. arkansanum (Nutt.) A. Gray
Erysimum asperum var. capitatum (Douglas ex Hook.) B. Boivin
Erysimum asperum var. purshii Durand
Erysimum capitatum var. amoenum (Greene) R.J. Davis
Erysimum capitatum var. argillosum (Greene) R.J. Davis
Erysimum capitatum var. stellatum (J.T. Howell) Twisselmann
Erysimum capitatum var. washoense G. Rossb.
Erysimum desertorum (Woot. & Standl.) G. Rossb.
Erysimum elatum Nutt.
Erysimum moniliforme Eastw.
Erysimum nivale (Greene) Rydb.
Erysimum wheeleri Rothr.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References