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

	plants annual; NOT [plants perennial]
	bracts below inflorescence lanceolate to subulate; NOT [bracts below inflorescence elliptic to narrowly ovate to more or less oblong]
	inflorescence diffuse; NOT [flowers crowded]
	umbel with pedicels over 5 mm long; NOT [umbel subcapitate, the pedicels very short]
	flowers small; NOT [flowers large]
	corolla of about the same length as the calyx; NOT [corolla much longer than the calyx] (FOA)

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

	annuals; NOT [perennials]
	leaves all basal (but with leafy bracts below umbels of flowers) ; NOT [leaves all or chiefly cauline]
	flowers in terminal umbels of few to many flowers; NOT [flowers solitary or 1-3 on a peduncle]
	flowers small
	sepals not reflexed
	corolla present; NOT [corolla absent]
	tube of corolla shorter than calyx; NOT [tube of corolla as long as or longer than calyx] (BF)
	corolla tube mostly shorter than the calyx; NOT [corolla tube equalling or longer than the calyx] (FOA)
	corolla-lobes erect or spreading; NOT [corolla-lobes sharply reflexed]
	corolla white; NOT [corolla lilac or pinkish]
	stamens separate; NOT [stamens more or less united, the anthers connivent around the style]
	style minute; NOT [style slender]

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

	herbs; NOT [shrubs or trees]
	plants green or with some chlorophyll; NOT [plants parasitic or saprophytic, without chlorophyll]
	plants without milky juice
	plants not twining
	flowers not in heads or spikes; NOT [flowers in long or short spikes], NOT [flowers in heads or in form resembling a head]
	flowers with two floral rings
	corolla regular; NOT [corolla irregular]
	petals wholly or partly united forming a tube or bell
	stamens directly in front of corolla lobes; NOT [stamens alternating with corolla lobes, or twice their number]
	ovary superior; NOT [ovary inferior]