Prunus americana
 
American Plum

Thorn on Dead Branch

One Mile West of Melita
28-July-2015

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Americana: Answers to key questions in Budd's Flora leading to this species. 
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teeth of leaves deeper; NOT [teeth of leaves not very deep]

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teeth of leaves not gland-tipped; NOT [teeth of leaves tipped with a small gland]

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flowers in small umbels or corymbs; NOT [flowers in long racemes at the ends of the branches]

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lobes of sepals not toothed

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lobes of sepals not glandular

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fruit round; NOT [fruit oval]

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stone more or less flattened

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stone with a groove on the end

 

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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]