Calypso bulbosa
 
Venus Slipper

Flower Front

Fir River Road West of Hudson Bay
28-May-2015

The exceptional petal of an orchid is called the labellum.

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Calypso: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus. 
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plants with a single (basal) leaf; NOT [plants with 2 or more leaves]

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scape with sheathing bracts

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leaf 2-6 cm long; NOT [leaf 10-20 cm long]

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leaf oval to round-ovate; NOT [leaf linear]

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flower solitary; NOT [flowers 2 to many, in racemes or spikes]

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flower 15-20 mm long; NOT  [flower 20-30 mm long], NOT [flower large, to 8 cm long]

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flower purplish; NOT [flower rose purplish]

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lip a large inflated sac or pouch; NOT [lip otherwise]

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fertile anther 1; NOT [fertile anthers 2]