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]