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David
Douglas collected the first specimens of this plant in "rocky
places of the Columbia, near the sea; and at Puget Sound" (quotation
from Intermountain Flora). Douglas named the plant Cheiranthus capitatus in William
Hooker's Flora Boreali-Americana, 1829. (Click the title to read.) The plant was renamed Erysimum
capitatum by Edward Greene in 1891. The plant has endured
several dozen name changes since Douglas collected it.
There is still some disagreement about the name of and characteristics of this plant: 1) Both Weber and Intermountain Flora state that our widely distributed and highly variable common Erysimum is E. capitatum and that E. asperum is a plant of the plains, primarily differing from S. capitatum by having seed pods that are quite hairy and extending almost at right angles from the stem. E. capitatum seed pods are smooth and nearly vertical (almost parallel to the stem). Weber states that on the West Slope E. asperum exists only in the far northern counties. 2) Stanley Welsh, who almost always retains the plant names used by Intermountain Flora, takes a very different position and states that all of the Utah plants (and I infer, West Slope Colorado plants also) are E. asperum, i.e., E. capitatum is really E. asperum. 3) Based on the collections of Heil and O'Kane for their Flora of the Four Corners book, The Synthesis of the North American Flora recognizes both species in the Four Corners area. (See range maps below.) Linnaeus named this genus in 1753. "Erysimum", from the Greek "eryomai" meaning "help" or "save", refers to the centuries old belief that the plant had medicinal properties."Capitatum" (Latin for "head", as in "decapitate’) refers to the rounded, head-shaped flower cluster. Asperum" means "rough". |
Erysimum capitatum (Wallflower) Semi-desert
to
alpine. Woodlands, meadows. Spring, summer. At the lower elevations of the Four Corners region, Erysimum capitatum is often found at the base of Juniperus osteosperma, Utah Juniper. |
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Erysimum
capitatum (Western Wallflower) Semi-desert
to
alpine. Woodlands, meadows. Spring, summer. Erysimum capitatum is a handsome plant often brightening the dry-brown duff under Junipers and Pinyons in the early spring. In the first photograph at left, the over-wintering basal rosettes are evident. In the second photograph a quite young, short, and vibrant green plant flowers in mid-March. Erysimum capitatum is a wide-spread, common, and highly variable species. Stanley Welsh indicates that this plant "demonstrates greater ecological latitude than any other Utah plant; it occurs from the lowest to the highest elevations in the state". Erysimum capitatum is, in William Weber's words, "extremely variable". Linnaeus named the Erysimum genus from the Greek word "eryomai", "to help" because of the medicinal properties of the plants. The species was first collected for science by David Douglas in the early 1800s in "rocky places of the Columbia [River], near the sea; and at Puget Sound". Meriwether Lewis collected this species prior to Douglas but his collection was never properly described and thus he is not given credit for its discovery. See my Lewis biography for a discussion of the problems that occured with Lewis' collections. Latin gives us the "capitatum" for "head", referring to the ball-like, head-like flower cluster (see below). |
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Erysimum capitatum (Western Wallflower) Semi-desert
to
alpine. Woodlands, meadows. Spring, summer. Several weeks later, plants in the same area as those above left are over a foot tall and the spreading and then ascending seed pods (siliques) have begun maturing (just to the right of the curved leaf below center right). |
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Erysimum capitatum
(Western Wallflower) Semi-desert
to alpine. Woodlands, meadows. Spring, summer. At lower elevations Wallflower blooms in the very early spring; later in the summer (as shown at left) it can be found above tree line in open meadows. From habitat to habitat it ranges from just a few inches tall to well over two feet. Although flowers are most often vibrant lemon yellow, they can be greenish-yellow (as shown below), cream, or even lavender. Erysimum capitatum grows solitary, in small groups, or scattered over a large area. |
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Erysimum capitatum
(Western Wallflower) Semi-desert
to
alpine. Woodlands, meadows. Spring, summer. |
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Erysimum capitatum
(Western Wallflower) Semi-desert
to
alpine. Woodlands, meadows. Spring, summer. The narrow and nearly vertical seed pods of the dwarf alpine Erysimum capitatum in the top photograph at left are two inches long. Those in the second photograph are three inches long. At all elevations, pods range from one to four inches long. Click to see the wide color variation of Erysimum capitatum. |
Range map © John Kartesz,
County Color Key
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Range map for Erysimum asperum Range map for Erysimum capitatum |