Kentucky Nature Preserves Rare Plants

Kentucky State Nature Preserves Commission

Stemless Evening-primrose
Oenothera triloba
Family: Onagraceae

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

Global Rank: G4
State Rank: S1S2

Dry woods, barrens, and prairies, often calcareous; in KY, glades, dry limestone soil, rock outcrops in fields.

Species Description:
Winter annual or biennial herb.

Flowering Period: Early May to mid July.

Additional Information at NatureServe

Diagnostic Characteristics:
Plant stemless, the yellow flowers at the level of the basal leaves; open ground in areas with cedar glades; fruits 4-winged, 1-2 cm.

Timber removal may be beneficial and even needed to maintain the open character of the habitat for this species. Hand removal of trees in the vicinity of the population is necessary to avoid impacts from timber operations. 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:

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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