- Types:
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Spiranthes cernua, screw augur
an orchid of the genus Spiranthes having tall erect densely flowered spiraling clusters of creamy white vanilla-scented flowers; widely distributed especially in low damp places of eastern and central North America
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Spiranthes romanzoffiana, hooded ladies' tresses
orchid having dense clusters of gently spiraling creamy white flowers with 2 upper petals forming a hood; western North America
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Spiranthes porrifolia, western ladies' tresses
similar to Spiranthes romanzoffiana;States
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European ladies' tresses, Spiranthes spiralis
European orchid having shorter racemes of strongly spiraling snow-white flowers
