Cypripedium arietinum
 
Ram's-Head Lady's-Slipper

Several Plants

Eastern Saskatchewan
15-June-2009

Note that the remains of the previous year's capsules can be seen in this photo.

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Arietinum: Answers to key questions in Budd's Flora leading to this species. 
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lower sepals separate and spreading; NOT [lower sepals united, usually 2-veined or 2-toothed]

 
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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]