Kentucky Nature Preserves Rare Plants

Kentucky State Nature Preserves Commission

Thread-like Naiad
Najas gracillima
Family: Najadaceae

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

Global Rank: G5?
State Rank: S2S3

Muddy or sandy ponds and shores.

Species Description:
Aquatic annual herb.

Flowering Period: mostly July - September

Additional Information at NatureServe

Diagnostic Characteristics:
Like its name indicates, Najas gracillima is a submersed aquatic species that looks like a mass of brown thread. This is a species that is difficult to identify in the field. Characters that distinguish this species are leaf teeth that are generally inconspicuous and unicellular and there are 13-17 per leaf side. Seeds are slightly recurved. See Jones (2005) for additional characters.

Avoid changes in moisture/hydrologic conditions at the site. Changes could result from overstory removal, stream/wetland alteration or vegetation removal that would result in increased erosion.

Global Range:
Najas gracillima occurs from Nova Scotia south to North Carolina, and west to Minnesota, Illinois, and Missouri. It also occurs in Alabama and Mississippi.

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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