Definition

Noun: 1. A specific type of orchid: A terrestrial orchid (Spiranthes cernua and related species) characterized by a tall, slender stalk bearing a dense, spiraling cluster of small, fragrant, creamy-white flowers. It is commonly found in moist or damp habitats.

Usage

• As a common name for a plant: The term "screw augur" is used primarily in botanical contexts or regional dialects to identify this particular orchid. It describes the plant's appearance, as the flower spike resembles the spiral thread of an auger drill bit.
  • A colony of screw augur was thriving in the wet meadow.
  • The screw augur is also commonly known as "nodding ladies' tresses".

Advanced Usage

• The name "screw augur" is an example of a folk name or common name derived from a visual analogy (the spiral flower arrangement) rather than a scientific description. Its use is more frequent in field guides and local conversation than in formal scientific writing, where the genus name or the full binomial nomenclature is preferred.

Variants and Related Words

• Nodding ladies' tresses: The more widely recognized common name for the same orchid species ().
• Spiranthes: The genus name for a group of orchids commonly called "ladies' tresses", which includes the screw augur.
• Terrestrial orchid: A general term for orchids that grow in the ground, as opposed to on trees (epiphytes).

Synonyms

• Nodding ladies' tresses
• (scientific name)

Notes

• Important Distinction: "Screw augur" refers specifically to the orchid plant. It is not a tool. The tool is correctly spelled and named a screw auger (or simply an auger), which is a drill bit for boring holes. The plant name is a homophonic variant based on its spiral shape.

Noun

1. 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