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Erysimum capitatum var. purshii (Dur.) Rollins  
Family: Brassicaceae
Pursh's wallflower
[Erysimum amoenum (Greene) Rydb., moreErysimum argillosum (Greene) Rydb., Erysimum asperrimum (Greene) Rydb., Erysimum asperum var. amoenum (Greene) Reveal, Erysimum asperum var. purshii Dur., Erysimum capitatum var. amoenum (Greene) R.J. Davis, Erysimum capitatum var. argillosum (Greene) R.J. Davis, Erysimum desertorum (Woot. & Standl.) G. Rossb., Erysimum nivale (Greene) Rydb.]
Erysimum capitatum var. purshii image
Patrick Alexander
  • FNA
  • Resources
Ihsan A. Al-Shehbaz in Flora of North America (vol. 7)
Proximal leaves with mostly 2- or 3-rayed trichomes adaxially. Flowers: petals usually yellow, rarely lavender or purplish. Fruits usually 4-angled, rarely latiseptate. Seeds 1.5-2(-2.4) × 0.7-1.2 mm; not winged. 2n = 36. Flowering Apr-Sep. Meadows, dry slopes, hillsides; 1000-3800 m; Yukon; Alaska, Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Tex., Utah, Wyo.; Mexico (Chihuahua, Michoacán, Sonora, Zacatecas). Plants of var. purshii were placed by G. B. Rossbach (1958) in three species (Erysimum angustatum, E. argillosum, E. desertorum) and by R. C. Rollins (1993) in two species (E. angustatum, E. capitatum). The considerable overlap in morphology and the frequent hybridization between vars. capitatum and purshii in areas where their geographical ranges meet argue against such delimitation. Forms with linear leaves to 3 mm wide, which are restricted to eastern Alaska and western Yukon, were recognized by Rossbach and Rollins as E. angustatum, but these hardly differ from typical var. purshii in all other characters.

Erysimum capitatum var. purshii
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Erysimum capitatum var. purshii image
Patrick Alexander
Erysimum capitatum var. purshii image
Tony Frates
Erysimum capitatum var. purshii image
Patrick Alexander
Erysimum capitatum var. purshii image
Patrick Alexander
Erysimum capitatum var. purshii image
Teague Embrey
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The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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