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

	shrubs or small trees less than 5 m high; NOT [trees 6-10 m high]
	winter-buds glabrous, glutinous or rufous-pilose; NOT [winter-buds densely white-villose]
	leaflets usually 11-13; NOT [leaflets usually 7-11]
	leaflets generally less than 13; NOT [leaflets 13 or more]
	leaflets acute or acuminate at apex; NOT [leaflets rounded at the apex] (FOA)
	leaflets serrate to near the base; NOT [leaflets entire toward the base]
	young twigs and inflorescence white-pubescent; NOT [young twigs and inflorescence with rust-coloured hairs]
	inflorescence broad, flat-topped; NOT [inflorescence small, rounded]
	styles 3-5; NOT [styles 2-3]

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

	small trees; NOT [shrubs], NOT [herbs, or with a woody base and otherwise herbaceous]
	leaves pinnately compound; NOT [leaves simple], NOT [leaves lobed]
	leaflets 11-17; NOT [leaflets 3-11]
	flowers in broad compound corymbs
	flowers white; NOT [flowers yellow or pink]
	ovary inferior, enclosed in and adnate to the hypanthium; NOT [ovary or ovaries superior, hypanthium shaped like a saucer, cup or urn and free from the ovary]
	fruit a pome but often berry-like, more or less fleshy; NOT [fruit dry]

Rosaceae: Answers to key questions in Budd's Flora leading to this family.  These answers do not apply to all members of the Rosaceae family, but they all do apply to this species.

	shrubs or trees; NOT [herbs]
	plants NOT climbing
	plants with normal leaves
	leaves alternate; NOT [leaves opposite]
	leaves compound; NOT [leaves simple]
	leaflets NOT leathery
	leaflets NOT spinose-tipped
	flowers with two floral rings, and with each petal distinct from the others]
	flowers perfect; NOT [flowers dioecious or perfect]
	flowers NOT legume-like
	petals 5
	stamens numerous; NOT [stamens 5]
	fruit not a legume