1	"Vegetative parts hirsute (usually sparsely) with long straight hairs"	2
1	"Vegetative parts, if hairy, not with long straight hairs"	3
2	"Most flowers with 4 stamens"	"Cardamine  hirsuta"
2	"Most flowers with 6 stamens"	"Cardamine  flexuosa"
3	"Plants semi-aquatic; leaves reducing to filiform"	"Cardamine  tenuifolia"
3	"Plants mostly terrestrial; leaves not filiform"	4
4	"Petals up to 4 mm long"	"Cardamine  paucijuga"
4	"Petals 4 mm or more long"	"Cardamine  gunnii"