Erysimum capitatum (Douglas ex Hook.) Greene
Western wallflower, sanddune wallflower
Coastal wallflower is native to North America. It is a member of the very large mustard family.
Identification: Plants are 12-48" (30-121 cm) tall, often with a single stem, sometimes with a few branches. Stems are coated with grayish hairs lying parallel against the stem. There is a basal rosette of many narrow leaves with variable shape and size, smooth-edged or toothed, 1-4½" (3-12 cm) × ¹/₁₆-⅜" (2-10 mm). Narrow leaves also appear sparsely along the stem. Flowers have four flat petals, and are 1-1¾" (3-5 cm) in diameter. They are yellow to deep orange, sometimes purplish-maroon or white; appearing from March to August. Fruits are upward-pointing pods 1-4" (3-10 cm) long and about ¹/₃₂" (1.5 mm) wide, four-sided.
Erysimum capitatum at Southeastern Arizona Wildflowers and the Plants of the Sonoran Desert
Erysimum capitatum on the USDA Plants Database
Erysimum capitatum on Wikipedia
Erysimum capitatum on Wildflowers, Ferns & Trees of Colorado, New Mexico, Arizona, and Utah
Erysimum capitatum on CalPhotos
Erysimum capitatum on Montana Plant Life
Erysimum capitatum on Turner Photographics' Wildflowers site
Erysimum capitatum on Eastern Colorado Wildflowers
Erysimum capitatum on SEINet—the Southwest Environmental Information Network
Erysimum capitatum from the Jepson Manual
Erysimum capitatum description by Thomas H. Kent, last updated 25 May 2020.
Range: Zones 3-7: