Species Factsheets

Fimbristylis annua

Annual Fimbry

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State Status: Pennsylvania Threatened (PT)
PBS Status: Pennsylvania Threatened (PT)
Federal Status:

Global Rank: G5 rank interpretation
State Rank: S2

Did You Know?

This plant, as well as others from its genus, can be used as medicinal herbs, perfumes or as decorations.

Fimbristylis annua


Annual fimbry (Fimbristylis annua) is an annual graminoid herb that usually is less than 15cm in height. The plants grow in tufted clumps and have thin, wiry stems that emerge from slender roots. The leaves are relatively few, less than 3mm wide, have flat or inrolled edges, and occur mostly at the base of the plant. The flowers, appearing from July to October, are minute and are grouped in brown, egg-shaped spikelets. Up to ten spikelets are clustered at the top of each stem, with the spikelets seeming to emerge from one point on the stem. The mature fruits are about one to one and a half mm long.

Rank Justification

Imperiled in the nation or state because of rarity due to very restricted range, very few populations (often 20 or fewer), steep declines, or other factors making it very vulnerable to extirpation from the nation or state.


The PA Biological Survey (PABS) considers annual fimbry to be a species of special concern, based on the few occurrences that have been recently confirmed and its specialized habitat on serpentine barrens. It has a PA legal rarity status and a PABS suggested rarity status of Threatened. About twelve populations are currently known from the state.


It grows in damp depressions or seasonal seepages on serpentine barrens.

Survey Dates

Flowers, fruits July - October


In Pennsylvania, it is at a northern border of its range, and has been documented historically in a few southeastern counties.



The viability of populations of annual fimbry and its serpentine habitat will require maintaining early successional conditions and natural hydrology patterns, and controlling invasive species. Active management, through the use of fire, scraping, or mowing, may be needed to create the proper successional stage and ecological conditions for this species to thrive.

Conservation Status Map


Map Legend

NatureServe. 2017. NatureServe Explorer: An online encyclopedia of life [web application]. Version 7.1. NatureServe, Arlington, Virginia. Available https://explorer.natureserve.org.


  • NatureServe. 2018. NatureServe Explorer: An online encyclopedia of life [web application]. Version 7.1. NatureServe, Arlington, Virginia. Available at https://www.natureserve.org/explorer
  • Pennsylvania Natural Heritage Program. 2018.
  • Rhoads, A.F. and W.M. Klein, Jr. 1993. The Vascular Flora of Pennsylvania. American Philosophical Society, Philadelphia, Pennsylvania. Rhoads, A.F. and T.A. Block.
  • 2007. The Plants of Pennsylvania: An Illustrated Manual. 2nd edition. University of Pennsylvania Press, Philadelphia, Pennsylvania.
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