Kentucky Nature Preserves Rare Plants

Kentucky State Nature Preserves Commission

Kidney-leaf Twayblade
Listera smallii
Family: Orchidaceae

Protection Status:
State Status:  T
USFWS Status: {null}

Global Rank: G4
State Rank: S2

Humus of damp woods and thickets, bogs or shaded, weed-free humus below rhododendron on mountain slopes and stream heads.

Species Description:
A small, delicate herb with one pair of opposite leaves and a teminal raceme of up to 15 brownish green flowers.

Flowering Period: Early June to mid August.

Additional Information at NatureServe

Diagnostic Characteristics:
Lip not cleft to the middle, lip narrowed to the base, column conspicuous. Pedicels glabrous, lateral teeth conspicuously projecting.

Timber removal would be very likely detrimental because of resulting changes in soil moisture level on these forested slopes. Roads, trails or other disturbance that create soil disturbance could have similar results. Pest plant invasion would also degrade the habitat supporting this plant.

Global Range:
Appalachian endemic, Pennsylvania to N. Carolina/Tennessee. Considered rare in Maryland (B1), West Virginia (B3), Kentucky, Tennessee. Tennessee: about six occurrences recently extant.

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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