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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 1-4′ (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. Online References:
Southeastern Arizona Wildflowers and the Plants of the Sonoran Desert Wildflowers, Ferns & Trees of Colorado, New Mexico, Arizona, and Utah Turner Photographics' Wildflowers site SEINet—the Southwest Environmental Information Network
Erysimum capitatum description by Thomas H. Kent, last updated 25 May 2020.
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5/22/2009 · Slide Rock State Park, Sedona, Arizona · ≈ 8 × 12″ (19 × 29 cm)
5/22/2009 · Slide Rock State Park, Sedona, Arizona · ≈ 5 × 8″ (13 × 20 cm) Range: Zones 3-7:
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ID is uncertain 
