Prunus pensylvanica
 
Pin Cherry

Corymb Side

Struthers Lake Regional Park
28-May-2011

Note the key to the species in Flora of Alberta requires that the petioles of P. pensylvanica be glandular at the upper end, while the petioles of P. virginiana have no glands at the upper end.  In fact, both species usually have glands at the upper ends of their petioles.  The rest of the answers to the key questions appear below.

bullet

Pensylvanica: Answers to key questions in Budd's Flora and Flora of Alberta leading to this species. 
bullet

tall shrub or small tree; NOT [low shrub]

bullet

leaves lanceolate; NOT [leaves elliptic to obovate]

bullet

leaves irregularly serrulate with rounded teeth; NOT [leaves sharply serrate]

bullet

leaves long-acuminate; NOT [leaves abruptly short-acuminate]

bullet

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

bullet

flowers 12-25 mm across; NOT [flowers 6-12 mm across]

bullet

stone NOT flattened; NOT [stone more or less flattened]

bullet

stone NOT grooved; NOT [stone with a groove on the end]

 

bullet

Prunus: Answers to key questions in Budd's Flora  and Flora of Alberta leading to this genus. 
bullet

shrubs or trees; NOT [herbs, or with a woody base and otherwise herbaceous]

bullet

plants taller; NOT [creeping dwarf shrubs]

bullet

plants NOT spiny

bullet

leaves simple; NOT [leaves compound or lobed]

bullet

leaves serrate or toothed; NOT [leaves entire]

bullet

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

bullet

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

bullet

carpel 1; NOT [carpels 2 or more]

bullet

fruit fleshy; NOT [fruit a leathery follicle]

bullet

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

 

bullet

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

herbs; NOT [shrubs or trees]

bullet

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

bullet

plants NOT with colored milky juice

bullet

plants with more than one normal leaf

bullet

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

bullet

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

bullet

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

bullet

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

bullet

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

bullet

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

bullet

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