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

	plants herbaceous; NOT [plants shrubby, stem woody]
	stems erect or nearly so; NOT [stems decumbent to ascending]
	flowers not so crowded; NOT [flowers in dense terminal spikes or nodal clusters]
	inflorescence glandular
	flowers 15-25 mm long; NOT [flowers 8-12 mm long]; NOT [flowers 30-40 mm long]
	corolla broadly funnelform
	corolla white, finely purplish lined or spotted; NOT [corolla blue, purplish, or lilac]
	style not yellow-pilose; NOT [style yellowish, long-pilose]
	style included; NOT [style exserted]

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

	leaves NOT all basal
	cauline leaves opposite; NOT [cauline leaves alternate]
	calyx 5-lobed; NOT [calyx 4-lobed]
	corolla NOT spurred at the base
	four anther-bearing stamens and one long sterile stamen (staminode); NOT [two or four anther-bearing stamens and no sterile stamen], NOT [five anther-bearing stamens]
	staminode present, filamentous; NOT [staminode absent or scale-like]

Scrophulariaceae: 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 NOT aquatic
	stems NOT square
	leaves NOT bearing bladders
	flowers NOT in heads or spikes; NOT [flowers in long or short spikes], NOT [flowers in heads or in form resembling a head]
	corolla irregular; NOT [corolla regular]
	ovary superior; NOT [ovary inferior]
	fruit a many-seeded capsule; NOT [fruit with 4 nutlets]