Erysimum capitatum (Western Wallflower) - photos and description

Erysimum capitatum

Erysimum capitatum

Erysimum capitatum
15 cm ruler for scale

Erysimum capitatum

Erysimum capitatum
Basal leaf in above photo

Erysimum capitatum
Stem leaf in above photo

General: Upright plant with stiff stems. Foliage is covered with stiff short hairs, making it rough to touch.

Flowers: Flowers bright yellow in globose raceme, flowers measured to 18 mm diameter. Flowers fragrant.

Leaves: Basal leaves linear with long petioles, a few teeth, the basal leaf highlighted in the photo above was 55 mm long (including petiole) and 6 mm wide. Stem leaves alternate, reduced upwards, linear to linear-lanceolate, sessile, also with a few teeth, the stem leaf highlighted in the photo above was 30 mm long and 4 mm wide.

Height: Budd's Flora lists the height to 60 cm. We measured plants to 43 cm tall.

Habitat: Light and sandy prairie.

Abundance: Common.

Origin: Native.

Synonym: Listed in some of the field guides we use as Erysimum asperum.

Similar species: Might be confused with Erysimum inconspicuum, however that plant has flowers 6 to 8 mm diameter, while Erysimum capitatum has flowers 2 cm diameter (Taxonomic Reminder for Recognizing Saskatchewan Plants).

When and where photographed: Above photos were taken June 1st in a sandy pasture near Mortlach, about 100 km west of Regina, SK, and July 13th on prairie near Arcola, about 200 km southeast of our home in Regina, SK.