Esula: Answers to key questions in Budd's Flora (BF)  and Flora of Alberta (FOA) leading to this species. 

	perennial; NOT [annual]
	erect plants; NOT [prostrate mat-like plants]
	leaves NOT very crowded; NOT [leaves crowded on stem]
	leaves more than 3 mm wide; NOT [leaves less than 3 mm wide]
	leaves usually not over 1 cm wide; NOT [leaves usually 1-3 cm wide]
	leaves linear or lanceolate; NOT [leaves obovate]
	leaves pointed at end; NOT [leaves rounded or blunt at end]
	stem leaves entire; NOT [stem leaves finely serrulate]
	upper leaves NOT with a white margin; NOT [upper leaves with a conspicuous white margin]
	inflorescence in terminal umbels; NOT [inflorescence in leaf axils]
	inflorescence NOT very leafy

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

	herbs; NOT [shrubs or trees]
	land plants; NOT [water plants]
	plants NOT parasitic on trees, rooted in soil or water; NOT [plants parasitic on branches of trees]
	plants WITH milky sap
	flowers with only one floral ring, with sepals but not petals
	stamens or pistils in separate flowers on the same plant; NOT [stamens and pistils in each flower]
	fruit splitting open at maturity
	fruit 3-seeded