Erysimum asperum

 Western Wallflower

G.F. Ledingham Herbarium
University of Regina

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Asperum:  Answers to key questions in Budd's Flora and Flora of Alberta leading to this species.  
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plants 2-4 dm high

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pubescence of leaves mostly of bifid hairs

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flowers smaller than 2-4 cm across

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petals yellow

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petals 12-20 mm long

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siliques 2-10 cm long, not 1-3 cm long

 
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Erysimum: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus.  Note that there is a contradiction in the answers from Flora of Alberta (FOA) regarding whether the leaves are entire or not.  The upper leaves of this species are entire; the lower leaves slightly toothed.  Note also that the length of the petals specified in this genus key by FOA contradicts the length specified by FOA in the above species key.
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plants more or less pubescent

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stem hairs attached by the middle, appressed

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leaves NOT oval to elliptical, NOT entire (FOA)

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leaves simple, entire or slightly toothed (FOA)

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basal leaves NOT lyrate-pinnatifid

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cauline leaves NOT cordate-clasping

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stem leaves entire to dentate, not lobed (BF)

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flowers yellow

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petals less than 7 mm long (FOA)

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fruit pod-like (silique or silicle)

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pod dehiscent by 2 valves

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pods not compressed at right angles to the central partition

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pod more than 4 times as long as broad

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pod with a short slender beak or beakless

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seeds in 1 row in each locule

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seeds globose, ovoid or ellipsoid; NOT flattish

 
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Cruciferae: Answers to key questions in Budd's Flora leading to this family.
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herbs

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plants terrestrial or semi-aquatic

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plants not with colored milky juice

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plants with more than one normal leaf

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leaves without stipules, or having glands

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some or all leaves alternate

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calyx regular

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4 sepals

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corolla regular in shape

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4 petals

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stamens usually 6, 4 long and 2 short

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ovary superior

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1 or 2 carpels