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

	stems not spiny, or spines only at the nodes; NOT [stems densely spiny along the internodes] (BF)
	stems not prickly; NOT [stems more or less prickly] (FOA)
	stems not bristly; NOT [stems usually bristly] (FOA)
	leaves plicate (folded) in the bud; NOT [leaves convolute (rolled) in the bud]
	NOT [plants with leaves, young stems, inflorescence and fruits all glandular-puberulent]
	leaves dotted beneath with resinous glands or bearing stalked glands; NOT [leaves without resinous glands]
	inflorescence an elongated raceme, flowers numerous; NOT [inflorescence a reduced raceme, 1- to 3- flowered]
	pedicels much shorter than the bracts; NOT [pedicels much longer than the bracts]
	pedicels jointed below the ovary
	flowers regular; NOT [flowers slightly irregular]
	hypanthium-tube tubular to narrowly cup-shaped; NOT [hypanthium-tube broadly cup-shaped]
	flowers not golden yellow; NOT [flowers golden yellow to somewhat reddish]
	sepals greenish white or yellowish; NOT [sepals white]
	ovary lacking sessile glands; NOT [ovary usually with a few sessile glands]
	ovary and fruit glabrous; NOT [ovary and fruit more or less densely glandular pubescent]
	fruits black when mature; NOT [fruits reddish or blue-black when mature]

Grossulariaceae: Answers to key questions in Flora of Alberta leading to this family.

	plants NOT aquatic
	plants green; NOT [plants white, pink or reddish brown]
	shrubs; NOT [herbs]
	plants armed with prickles, spines or thorns; NOT [plants unarmed]
	leaves or branches armed, not both; NOT [leaves and branches both armed]
	branches with needle-like spines; NOT [branches with stout thorns (1) 2-7 cm long]
	leaves alternate; NOT [leaves opposite], NOT [leaves whorled]
	leaves well developed; NOT [leaves reduced to scales]
	leaves NOT pinnate
	leaves NOT spiny-margined
	stamens 5; NOT [stamens 10]
	...