Kentucky Nature Preserves Rare Plants

Kentucky State Nature Preserves Commission

Tansy Rosinweed
Silphium pinnatifidum
Family: Asteraceae

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

Global Rank: G3Q
State Rank: S3

Barrens and prairies.

Species Description:
Perennial herb.

Flowering Period: Early July to late September.

Additional Information at NatureServe

Diagnostic Characteristics:
Silphium pinnatifidum looks like prairie dock except that it has narrower leaves (usually) and they are pinnatid rather than just toothed. The leaves are all basally disposed.

Woody plant invasion may need to be controlled using periodic prescribed fire, mowing or other means to maintain the open character of the habitat for this species. Hand removal of trees in the vicinity of the species is necessary. Soil disturbance resulting from activities such as ATV trails, timber removal or any activity that results in increased erosion and weed invasion will be detrimental. Exotic pest plants are a threat to this species and should be removed.

Global Range:
Silphium pinnatifidum reportedly occurs in Wisconsin, Illinois, Indiana, Kentucky, Tennessee, Alabama, and Georgia (Kartesz, 1999).

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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