Cypripedium montanum
 
Mountain Lady's-Slipper

Flower Front/Top/Side

Centre Block, Cypress Hills Interprovincial Park
20-June-2013

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Montanum: Answers to key questions in Budd's Flora and Flora of Alberta leading to this species. 
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flowering stem leafy with 2-6 alternate leaves nearly to the top; NOT [flowering stem a naked scape, with 2 subopposite basal leaves]

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flowers generally 2-3 on stem; NOT [flower solitary]

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lower sepals united; NOT [lower sepals separate and spreading]

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lower sepals usually 2-veined or 2-toothed

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sepals often longer than the lip

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sepals 40-60 mm long; NOT [sepals 15-20 mm long]

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sepals lanceolate, attenuate; NOT [sepals obovate or oval]

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sepals greenish or purplish brown; NOT [sepals green, yellowish, or white], NOT [sepals greenish, crimson-striped]

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lateral petals 40-60 mm long; NOT [lateral petals 15-20 mm long]

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lateral petals greenish or purplish brown; NOT [lateral petals white], NOT [lateral petals greenish yellow to brownish], NOT [lateral petals greenish, crimson-striped]

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lip 2-4 cm long; NOT [lip 1-2 cm long]

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lip white; NOT [lip yellow], NOT [lip pink with red veins]

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lip with a rounded opening; NOT [lip cleft down the front]

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staminode ovate or obovate; NOT [staminode triangular]

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

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flowers large, to 8 cm long; NOT [flowers mostly smaller]

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lip a large inflated sac or pouch, moccasin-shaped); NOT [lip concave or flat, not moccasin-shaped]

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fertile anthers 2; NOT [fertile anther 1]