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

	annual or biennial; NOT [perennial]
	plant generally less than 5 dm tall; NOT [plant 5-12 dm tall]
	basal leaves at most pinnatifid; NOT [basal leaves bipinnatifid]
	upper leaves tapering at base; NOT [upper leaves sagittate or deeply cordate-clasping at the base]
	plants with elongated  terminal racemes; NOT [plants with short axillary racemes as well as terminal ones]
	petals none or rudimentary; NOT [petals linear, shorter than the sepals], NOT  [petals 2 mm long]
	stamens 2
	fruit 2.5-3.5 mm long; NOT [fruit 2.5-3.0 mm long]; NOT [silicle 5-7 mm long]
	fruit round-cordate or round-obovate; NOT [fruit oval or elliptic-ovate] (BF)
	fruit orbicular to obovate, widest above the middle; NOT [fruit elliptic to ovate, widest at or below the middle] (FOA)
	fruit rounded at the apex; NOT [fruit gradually narrowed toward acute apical teeth, one tooth on each side of apex]
	fruit notched at the apex
	fruit not winged
	fruit glabrous

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

	plants mostly terrestrial; NOT [plants aquatic, usually submerged]
	plants of lowland habitats; NOT [plants of alpine habitats]
	plants with leafy stems; NOT [plants with basal leaves only]
	petals white (may be rudimentary or absent); NOT [petals yellow]
	fruit shorter; NOT [fruit 8-18 mm long]
	fruit not strongly inflated
	fruit flattened at right angles to septum; NOT [fruit flattened parallel to septum, if at all]
	fruit 2-3 times longer than broad or shorter; NOT [fruit much longer than broad]
	fruit not triangular
	fruit wingless or only narrowly winged towards the apex; NOT [fruit broadly winged all round]
	pods notched at apex
	one seed in each compartment of pod; NOT [more than one seed in each compartment of pod]

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
	calyx regular; NOT [calyx irregular, some sepals smaller than others]
	sepals 4
	corolla regular in shape; NOT [corolla irregular in shape]
	each petal distinct from the others
	petals 4; NOT [petals 5]
	ovary superior; NOT [ovary inferior]
	carpels 1 or 2; NOT [carpels 3-5]