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

	plants of northern bogs and springy places
	taller plants; NOT [dwarf plants, 3-10 cm tall]
	stem leaves deeply divided to pinnate; NOT [stem leaves entire or dentate, not lobed or divided]
	usually more flowers; NOT [flowers 1-5]
	flowers 15-25 mm across; NOT [flowers 3-10 mm across] (BF)
	petals 8-13 mm long; NOT [petals 1.5-4 mm long] (FOA)

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

	plants aquatic or of marshy habitats; NOT [plants of drier habitats]
	plants mostly glabrous; NOT [plants generally pubescent]
	leaves and stem with simple hairs (if any); NOT [leaves and stem usually with forked or starry hairs]
	petals white, pink-tinged, pink or purple; NOT [petals yellow]
	pods usually at least 4 times as long as wide; NOT [pods usually not more than 3 times as long as wide]
	pods linear; NOT [pods oblong to globular]
	pods straight; NOT [pods more or less falcate]
	pods not moniliform
	pods cylindric or 4-angled in cross section; NOT [pods flattened]
	pods not compressed at right angles to the central partition
	pods scarcely beaked; NOT [pods with a long, distinct beak]
	fruit dehiscent; NOT [fruit indehiscent]
	seeds uniseriate; NOT [seeds biseriate]

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]
	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]