Kentucky Nature Preserves Rare Plants

Kentucky State Nature Preserves Commission

Butler's Quillwort
Isoetes butleri
Family: Isoetaceae

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

Global Rank: G4
State Rank: S1

Shallow depressions and ledges of limestone glades and prairies.

Species Description:
Perennial herb.

Flowering Period: Early April to late June.

Additional Information at NatureServe

Diagnostic Characteristics:
This species of quillwort is terrestrial and associated with calcareous soils and flat seasonally wet limestone outcrops. These plants produce spores at the base of the leaves and the megaspores produced by I.butleri average over 0.45 mm wide. Leaves are green to the base and can vary from 6-20 cm long.

Disturbance such as ATV trails, timber removal or any activity that results in increased erosion and weed invasion will be detrimental.

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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