Pulsatilla patens
 
Crocus

Involucre

Hudson Bay Regional Park
20-May-2017

This species is known as Anemone patens in Budd's Flora and Flora of Alberta, and that is the classification used in the notes below.

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Patens: Answers to key questions in Budd's Flora and Flora of Alberta leading to this species. 
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basal leaves expanding after flowering; NOT [basal leaves fully expanded  at flowering]

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bracts sessile; NOT [bracts short-petioled]

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flowers bluish or purplish; NOT [flowers white, sometimes purple-tinged]

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sepals 15-40 mm long; NOT [sepals 5-25 mm long]

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styles plumose

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styles 1.5-3.5 cm long; NOT [styles much shorter]

 

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Pulsatilla: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus. 
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plants not woody climbers

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leaves not all basal, stem leaves present; NOT [leaves all basal]

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cauline leaves whorled, forming a single involucre of leafy bracts some  distance below inflorescence; NOT [cauline leaves alternate]; NOT [cauline leaves opposite]

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leaf segments mostly toothed, acute; NOT [leaves 3-lobed, with the lobes entire, rounded]

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flowers perfect; NOT [flowers mostly imperfect, the plants dioecious]

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flowers regular; NOT [flowers irregular]

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flowers not spurred

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petals absent, but sepals colored and petal-like, though seldom yellow; NOT [petals usually present]

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sepals conspicuous

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sepals not greenish

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carpels 2 or more; NOT [carpel 1]

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ovaries 1-ovuled; NOT [ovaries several-ovuled]

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fruit an achene; NOT [fruit a follicle], NOT [fruit a berry]

 

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Ranunculaceae: Answers to key questions in Budd's Flora  leading to this family. Not all the answers apply to all members of Ranunculaceae, but they all do apply to genus Anemone.
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herbs; NOT [shrubs or trees]

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land plants; NOT [water plants]

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plants rooted in soil; NOT [plants parasitic on branches of trees]

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plants with more than one pair of leaves; NOT [plants stemless with a single pair of large reniform leaves]

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leaves alternate, lower ones sometimes opposite; NOT [leaves opposite]

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leaves without stipules; NOT [leaves with stipules free or sheathing the stem]

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leaves not orbicular or reniform

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leaves compound or simple, but very deeply divided; NOT [leaves not compound and not very deeply divided]

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stamens and pistils in each flower; NOT [stamens or pistils in separate flowers on the same plant]

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fruit dry when ripe; NOT [fruit fleshy when ripe]