| spiranthes | (n) large cosmopolitan genus of white-flowered terrestrial orchids, Syn. genus Spiranthes |
| european ladies' tresses | (n) European orchid having shorter racemes of strongly spiraling snow-white flowers, Syn. Spiranthes spiralis |
| hooded ladies' tresses | (n) orchid having dense clusters of gently spiraling creamy white flowers with 2 upper petals forming a hood; western North America, Syn. Spiranthes romanzoffiana |
| screw augur | (n) 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, Syn. Spiranthes cernua |
| western ladies' tresses | (n) similar to Spiranthes romanzoffiana;States, Syn. Spiranthes porrifolia |