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

	stems leafy; NOT [leaves in a basal rosette]
	all leaves opposite; NOT [leaves alternate]; NOT [upper leaves whorled]
	upper leaves stalkless; NOT [leaves with stalks]
	leaves 2-10 mm long; NOT [leaves 10-40 mm long]
	leaves ovate; NOT [leaves linear to lanceolate]
	leaves palmately lobed or with large teeth; NOT [leaves more less entire], NOT [leaves pinnately lobed or cleft]
	leaves palmately veined; NOT [leaves pinnately veined]
	floral leaves or bracts usually green; NOT [floral leaves or bracts brightly colored, usually red or yellow, or shades of these colours]
	flowers not solitary
	all flowers opposite; NOT [upper flowers whorled]
	flowers less than 10 mm long; NOT [flowers large and showy, 10-35 mm long]
	calyx much shorter; NOT [calyx about 1 cm long in flower]
	calyx 4-lobed; NOT [calyx 5-lobed]
	calyx not membranous
	calyx not much inflated in fruit
	corolla not spurred
	corolla white to yellow; NOT [corolla pinkish  purple]
	four anther bearing stamens, no sterile stamens

Osmorhiza: 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]
	flowers with two floral rings
	petals wholly or partly united forming a tube or bell
	corolla irregular; NOT [corolla regular]
	ovary superior; NOT [ovary inferior]
	fruit a many-seeded capsule; NOT [fruit with 4 nutlets]