1. An orchid of the genus Spiranthes having tall erect densely flowered spiralling clusters of creamy white vanilla-scented flowers; widely distributed especially in low damp places of eastern and central North America
   "The screw augur's spiral flower arrangement gives it a distinctive twisted appearance";
   - Spiranthes cernua

Derived forms: screw augurs

Type of: ladies' tresses, lady's tresses

Part of: genus Spiranthes, Spiranthes