Inconspicuum: Answers to key questions in Budd's Flora and Flora of Alberta leading to this species. 

	plants NOT alpine
	pubescence mostly or entirely of 2-branched hairs; NOT [pubescence mostly or entirely of trifid or stellate hairs]
	flowers smaller; NOT [flowers large, 2-4 cm across]
	petals shorter than 10 mm; NOT [petals longer than 10 mm] (BF)
	petals 6-12 mm long; NOT [petals 3-5 mm long], NOT [petals 15-25 mm long] (FOA)
	flowers yellow; NOT [flowers pink-purple or purple]
	style 1.0-1.5 mm long; NOT [style generally more than 1.5 mm long]
	stalks of seedpods not one-quarter as long as pods; NOT [stalks of seedpods almost half as long as pods]
	siliques 2-10 cm long; NOT [siliques 1–3 cm long]

Erysimum: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus. 

	plants of lowland areas; NOT [plants mostly of alpine areas]
	plants 2-10 dm tall; NOT [plants generally less than 2 dm tall]
	stem leaves entire to dentate, not lobed; NOT [stem leaves deeply lobed, lyrate to tripinnate] (BF)
	leaves more or less entire; NOT [leaves divided] (FOA)
	cauline leaves not auriculate and clasping; NOT [cauline leaves auriculate, clasping]
	pubescence consisting of hairs, attached at the middle; NOT [pubescence consisting of simple or several-forked hairs]
	petals yellow; NOT [petals white, pink-tinged, pink or purple]
	fruits NOT flattened
	pods NOT compressed at right angles to the central partition
	pods usually at least 4 times as long as wide; NOT [pods usually not more than 3 times as long as wide] (BF)
	fruit much longer than broad; NOT [fruit 2-3 times longer than broad or shorter] (FOA)
	pods scarcely beaked; NOT [pods with a long, distinct beak]

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

	herbs; NOT [shrubs or trees]
	plants terrestrial or semiaquatic; NOT [plants aquatic, leaves submerged or floating]
	plants NOT with colored milky juice
	plants with more than one normal leaf
	some or all leaves alternate; NOT [leaves opposite, whorled, or basal]
	leaves without stipules, or having glands; NOT [leaves with stipules]
	flowers with two floral rings, and with each petal distinct from the others]
	calyx regular; NOT [calyx irregular, some sepals smaller than others]
	sepals 4
	corolla regular in shape; NOT [corolla irregular in shape]
	petals 4; NOT [petals 5]
	stamens usually 6, four long and two short; NOT [stamens 6, of equal length], NOT [stamens usually more than 10]
	ovary superior; NOT [ovary inferior]
	carpels 1 or 2; NOT [carpels 3-5]