KNP Rare Plants Database


 
KY Office of Kentucky Nature Preserves




Stemless Evening-primrose
Oenothera triloba
Family: Onagraceae

Protection Status:
State Status:  T
USFWS Status: 

Global Rank: G4
State Rank: S1S2

   

Photo by Daniel Reed @ TENN
Habitat:
Dry woods, barrens, and prairies, often calcareous; in KY, glades, dry limestone soil, rock outcrops in fields.

Species Description:
Winter annual or biennial herb.

Phenology:
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.

Management:
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:
Species occurrence map

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Data Last Updated: November 2018
Office of Kentucky Nature Preserves
300 Sower Blvd
Frankfort,KY 40601
Phone: (502) 573-2886
Email:
naturepreserves@ky.gov
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