Arethusa bulbosa
 
Dragon's-Mouth

Flower Side in Ground

50 km North and 15 km East of Hudson Bay, SK
11-June-2016

Note the two small bracts at the base of the flower.

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Arethusa: Answers to key questions in Budd's Flora leading to this genus. 
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plants with a single basal leaf

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

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

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scape with sheathing bracts

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

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

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flower rose  purplish; NOT [flower purplish]

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lip concave or flat, not  mocassin-shaped; NOT [lip inflated and mocassin-shaped]

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fertile anther 1; NOT [fertile anthers 2]