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
agavaceae: chiefly tropical and xerophytic plants: includes Dracenaceae (Dracaenaceae); comprises plants that in some classifications are divided between the Amaryllidaceae and the Liliaceae