what does Spiranthes cernua mean?

SPIRANTHES CERNUA as NOUN

Meaning
- 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
Synonym(s)
- screw augur (what does screw augur mean?)
Hypernyms(s) Spiranthes cernua is a kind of… Example: animal is a hypernym of mammal, plant is a hypernym of flower
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