Prunus tomentosa
 
Nanking Cherry

Early Leaf Bottom

Saskatchewan Landing Provincial Park
23-May-2014

Note the pubescent surface.

This is an introduced species which has been planted in some provincial parks, including Buffalo Pound and Saskatchewan Landing.  It appears to be spreading somewhat in Saskatchewan Landing.  It is not included in Budd's Flora or Flora of Alberta, so there is no reference to a key to the species below.

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Prunus: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus. 
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shrubs or trees; NOT [herbs, or with a woody base and otherwise herbaceous]

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plants taller; NOT [creeping dwarf shrubs]

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plants NOT spiny

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leaves simple; NOT [leaves compound or lobed]

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leaves serrate or toothed; NOT [leaves entire]

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flowers usually more numerous; NOT [flowers solitary on a long peduncle]

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ovary or ovaries superior, hypanthium free from the ovary; NOT [ovary inferior, enclosed in and adnate to the hypanthium]

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carpel 1; NOT [carpels 2 or more]

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fruit fleshy; NOT [fruit a leathery follicle]

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fruit a red or black drupe with a single stone; NOT [fruit a berry-like pome with several seeds]

 

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Rosaceae: Answers to key questions in Budd's Flora  leading to this family. 
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herbs; NOT [shrubs or trees]

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plants terrestrial or semiaquatic; NOT [plants aquatic, leaves submerged or floating]

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plants NOT with colored milky juice

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plants with more than one normal leaf

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some or all leaves alternate; NOT [leaves opposite, whorled, or basal]

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leaves with stipules; NOT [leaves without stipules, or having glands]

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flowers with two floral rings, and with each petal distinct from the others

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flowers regular in shape; NOT [flowers irregular in shape]

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calyx regular; NOT [calyx irregular, some sepals smaller than others]

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stamens usually separate or partly so, not in a column; NOT [stamens numerous, united into a column]

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ovary of one or more carpels, either separate or enclosed by a fleshy receptacle; NOT [ovary of 5 united carpels]