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Definition of Screw augur
1. Noun. 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.
Exact synonyms: Spiranthes Cernua
Group relationships: Genus Spiranthes, Spiranthes
Generic synonyms: Ladies' Tresses, Lady's Tresses
Group relationships: Genus Spiranthes, Spiranthes
Generic synonyms: Ladies' Tresses, Lady's Tresses