[Wallflowers: The Genus Erysimum East of the Cascade Mts. of Oregon and Washington]

Douglas' Wallflower, Prairie Rocket, Rough Wallflower, Sanddune Wallflower, Western Wallflower

Erysimum capitatum var. capitatum

Synonyms: Erysimum arkansanum, Erysimum asperum, Erysimum asperum ssp. capitatum, Erysimum asperum var. arkansanum, Erysimum asperum var. capitatum , Erysimum capitaum var. stellatum, Erysimum capitatum var. washoense, Erysimum elatum, Erysimum moniliforme, Erysimum wheeleri

Douglas' Wallflower, Prairie Rocket, Rough Wallflower, Sanddune Wallflower, Western Wallflower: Erysimum capitatum var. capitatum (Synonyms: Erysimum arkansanum, Erysimum asperum, Erysimum asperum ssp. capitatum, Erysimum asperum var. arkansanum, Erysimum asperum var. capitatum , Erysimum capitaum var. stellatum, Erysimum capitatum var. washoense, Erysimum elatum, Erysimum moniliforme, Erysimum wheeleri)

The inflorescence of rough wallflower as seen from atop Bickleton Ridge in the Bickleton Ridge Unit of the Klickitat Wildlife Area..........May28, 2017.

Characteristics:

Rough wallflower is an attractive biennial to short-lived perennial wildflower with one to several, stout, simple stems from 10-120 cm high. The herbage consists of appressed twice-branched to many branched, radiate hairs, giving the stems and leaves a light, whitish cast. The leaves are linear, lanceolate or oblanceolate with entire to toothed and wavy leaf margins. The leaves are petiolate, 7-15 cm long, and often with the margins folded upwards from the midvein.

The inflorescence is a raceme of yellow to orange-yellow flowers at the apex of the stem. The sepals measure from 8-12 mm long while the petals are 15-25 mm long. The stout pedicels range from 8-13 mm long. The fruits are siliques which measure from 4-12 cm long and are 1-2 mm wide. They are spreading to ascending.


Habitat:

Rough wallflower is found on dry slopes from the valleys to high in the mountains.


Range:

Rough wallflower may be found east of the Cascade Mts. from southern British Columbia south through Washington to Oregon and east across most of the west to Manitoba, Minnesota, Kansas, Oklahoma and New Mexico. Its range extends westward through the Columbia River Gorge to the Willamette Valley and hence south to California.


Inflorescence of Douglas' Wallflower, Prairie Rocket, Rough Wallflower, Sanddune Wallflower, Western Wallflower: Erysimum capitatum var. capitatum (Synonyms: Erysimum arkansanum, Erysimum asperum, Erysimum asperum ssp. capitatum, Erysimum asperum var. arkansanum, Erysimum asperum var. capitatum , Erysimum capitaum var. stellatum, Erysimum capitatum var. washoense, Erysimum elatum, Erysimum moniliforme, Erysimum wheeleri) - Douglas' Wallflower, Prairie Rocket, Rough Wallflower, Sanddune Wallflower, Western Wallflower: Erysimum capitatum var. capitatum (Synonyms: Erysimum arkansanum, Erysimum asperum, Erysimum asperum ssp. capitatum, Erysimum asperum var. arkansanum, Erysimum asperum var. capitatum , Erysimum capitaum var. stellatum, Erysimum capitatum var. washoense, Erysimum elatum, Erysimum moniliforme, Erysimum wheeleri)

Rough wallflower blooming along the Flatiron Trail, Badlands Wilderness........May 12, 2018.

Douglas' Wallflower, Prairie Rocket, Rough Wallflower, Sanddune Wallflower, Western Wallflower: Erysimum capitatum var. capitatum (Synonyms: Erysimum arkansanum, Erysimum asperum, Erysimum asperum ssp. capitatum, Erysimum asperum var. arkansanum, Erysimum asperum var. capitatum , Erysimum capitaum var. stellatum, Erysimum capitatum var. washoense, Erysimum elatum, Erysimum moniliforme, Erysimum wheeleri)

Rough wallflower as seen along FS Road 5401-811, on the northern approach to Baldy Mountain, Malheur National Forest..........June 3, 2011.

Section of a seed pod of Douglas' Wallflower, Prairie Rocket, Rough Wallflower, Sanddune Wallflower, Western Wallflower: Erysimum capitatum var. capitatum (Synonyms: Erysimum arkansanum, Erysimum asperum, Erysimum asperum ssp. capitatum, Erysimum asperum var. arkansanum, Erysimum asperum var. capitatum , Erysimum capitaum var. stellatum, Erysimum capitatum var. washoense, Erysimum elatum, Erysimum moniliforme, Erysimum wheeleri)

The photo above shows a close-up of the seed pod shown above of rough wallflower with its squared-off corners, a characteristic of this species. Note the minute, appressed hairs covering the pod.

Close-up of a flower of Douglas' Wallflower, Prairie Rocket, Rough Wallflower, Sanddune Wallflower, Western Wallflower: Erysimum capitatum var. capitatum (Synonyms: Erysimum arkansanum, Erysimum asperum, Erysimum asperum ssp. capitatum, Erysimum asperum var. arkansanum, Erysimum asperum var. capitatum , Erysimum capitaum var. stellatum, Erysimum capitatum var. washoense, Erysimum elatum, Erysimum moniliforme, Erysimum wheeleri)

Rough wallflower as seen from the southern slopes of Mt. Adams..........May 2005.

Douglas' Wallflower, Prairie Rocket, Rough Wallflower, Sanddune Wallflower, Western Wallflower: Erysimum capitatum var. capitatum (Synonyms: Erysimum arkansanum, Erysimum asperum, Erysimum asperum ssp. capitatum, Erysimum asperum var. arkansanum, Erysimum asperum var. capitatum , Erysimum capitaum var. stellatum, Erysimum capitatum var. washoense, Erysimum elatum, Erysimum moniliforme, Erysimum wheeleri) - Douglas' Wallflower, Prairie Rocket, Rough Wallflower, Sanddune Wallflower, Western Wallflower: Erysimum capitatum var. capitatum (Synonyms: Erysimum arkansanum, Erysimum asperum, Erysimum asperum ssp. capitatum, Erysimum asperum var. arkansanum, Erysimum asperum var. capitatum , Erysimum capitaum var. stellatum, Erysimum capitatum var. washoense, Erysimum elatum, Erysimum moniliforme, Erysimum wheeleri)

Rough wallflower blooming in an avalanche shoot/drainage along the East Fork Lostine River Trail #1662 adjacent to Lost Lake, Eagle Cap Wilderness.........August 4, 2016.

Developing fruits of Douglas' Wallflower, Prairie Rocket, Rough Wallflower, Sanddune Wallflower, Western Wallflower: Erysimum capitatum var. capitatum (Synonyms: Erysimum arkansanum, Erysimum asperum, Erysimum asperum ssp. capitatum, Erysimum asperum var. arkansanum, Erysimum asperum var. capitatum , Erysimum capitaum var. stellatum, Erysimum capitatum var. washoense, Erysimum elatum, Erysimum moniliforme, Erysimum wheeleri)

The photo above shows a close-up of the inflorescence of rough wallflower as seen in meadows along Forest Road 40-020 at Ray Ridge Viewpoint, Umatilla National Forest...........June 25, 2007.


Paul Slichter