Kentucky Nature Preserves Rare Plants

Kentucky State Nature Preserves Commission

White Fringeless Orchid
Platanthera integrilabia
Family: Orchidaceae

Protection Status:
State Status:  E
USFWS Status: C

Global Rank: G2G3
State Rank: S1

Partial shade or open seepage areas both wooded and herbaceous including swamps, floodplain forests, seepage slopes.

Species Description:
A slender, erect, white-flowered perennial orchid, up to 6 dm tall. Growing in colonies from fleshy roots, usually with many sterile stems or leaves. The inflorescence a loose spike with up to 20 flowers. The spike round to short-oblong, 4-10 cm long and about 5 cm wide; lower bracts longest, gradually reduced upward. Flowers white, prominent, long-spurred, spreading-ascending, very fragrant in the evening.

Flowering Period: Early July to late September.

Additional Information at NatureServe

Diagnostic Characteristics:
The white fringeless orchid is a terrestrial orchid with white flowers clustered at the end of the flowering stem. The flowers lack fringing on the lip.

The habitat for this species is especially sensitive to changes in hydrology and not likely to withstand much alteration. Grazing or browsing pressure, vegetation removal, hydrologic changes (i.e. stream alterations road construction) would be detrimental. Exotic pest plants are a threat to this species and should be removed. Avoid creating access to the site through trail or road construction.

Global Range:
Occurrs on the Appalachian Plateaus of Kentucky, Tennessee, and Alabama, the Coastal Plain of Alabama and Mississippi, the Blue Ridge Province of Georgia , North Carolina (Historic), and Tennessee; the Ridge and Valley Province in Alabama, and the Piedmont of Georgia and South Carolina.

Known Kentucky Occurrences:

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Data last updated: Wednesday, May 28, 2014
Kentucky State Nature Preserves Commission
801 Teton Trail
Frankfort,KY 40601
Phone: (502) 573-2886
Fax: (502) 573-2355
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