Kentucky Nature Preserves Rare Plants


 
Kentucky State Nature Preserves Commission





Nodding Rattlesnake-root
Prenanthes crepidinea
Family: Asteraceae

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

Global Rank: G4
State Rank: S3

P
Habitat:
Calcareous forests and thickets usually in alluvial areas.

Species Description:
This is a perennial herb up to 2.7 m with numerous (25-35) cream colored flowers and a stout, smooth stem that exudes a milky juice when broken. Its leaves are generally deltoid and dentate lobed.

Phenology:
Flowering Period: Early August to late September.

Additional Information at NatureServe

Diagnostic Characteristics:
Cauline leaves well defined; heads ligulate, 20-35 flowered, corymbiform or paniculiform; principal bracts (10-) 12-13 (-15), pubescent; juice milky; achenes smooth, linear-oblong; pappus of simple capillary bristles. Plants 1-2.5 m and leafy, the leaves 25 x 20 cm and gradually reduced upwards; heads drooping, involucre 12-16 mm coarsely hirsute with green to black tinged principal bracts; flowers 20-35 per head.

Management:
Timber removal would be detrimental. Disturbance 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. Avoid creating access to the site through trail or road construction.

Global Range:
Prenanthes crepidinea occurs from western New York west to Minnesota and south to Kansas (reputedly), Arkansas, and Tennessee.

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
Email:
naturepreserves@ky.gov
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