Kentucky Nature Preserves Rare Plants

Kentucky State Nature Preserves Commission

Eastern Mock Bishop's-weed
Ptilimnium costatum
Family: Apiaceae

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

Global Rank: G4
State Rank: S1?

Swamps and wet woods.

Species Description:
Annual herb.

Flowering Period: Early July to late September.

Additional Information at NatureServe

Diagnostic Characteristics:
As with all Ptilimnium, this species has leaves divided into filiform segments and these are crowded together so they appear to be whorled. It is a robust plant. The bracts associated with flowers are not divided but are filiform, the sepals are lance-triangular (rather than deltoid) and the styles are 0.5-3m. The fruit are 3-3.5 mm long. Flowers are white and the umbels are on long peduncles.

Changes in moisture/hydrologic conditions of the habitat for this species would likely be detrimental. Changes could result from overstory removal, stream/wetland alteration or impacts due to erosion or soil deposition. Exotic pest plants are a threat to this species.

Global Range:
From North Carolina to Missouri and Texas (Weakley 1996).

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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