Populus tremuloides


Trembling Aspen

Mature Male Catkins

Five miles east of McLean
19-April-2004

 
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Tremuloides:  Answers to key questions in Budd's Flora and Flora of Alberta leading to this species.  
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bark of trunk (well above base) smoothish, light green or whitish; NOT deeply furrowed, NOT gray

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petioles distinctly flattened; NOT terete

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leaves NOT coarsely toothed

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leaves small, roundish in outline, with the margins finely crenate to nearly entire; NOT large, NOT broadly deltoid to cordate in outline, margins NOT coarsely dentate

 
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Populus: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus. 
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trees; NOT shrubs

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winter buds covered by several scales; NOT just one

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catkins soon drooping; NOT erect or divergent

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bracts below flowers mostly lacerate; NOT entire; NOT merely toothed

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a broad or cup-shaped disk below each flower

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stamens usually more than 10; NOT 2 to 10

 
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Salicaceae: Answers to key questions in Budd's Flora leading to this family.
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shrubs or trees

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males flowers, at least, in catkins or aments

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seeds each with a tuft of hairs