Species Factsheets

Carex flava

Yellow Sedge

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

Global Rank: G5 rank interpretation
State Rank: S2

Carex flava

Description

Yellow Sedge is a perennial grass-like plant with three-sided aerial stems that may grow to 0.6 m in height. The leaves include a sheathing basal portion and an elongate and narrow blade that is alternately arranged and averages about 2.5-5 mm in width. The minute flowers, which appear in spring, are clustered at two or more points on the upper stem, with the male flowers at the very top and 1 or 2 female flower clusters lower on the stem. The plant is most recognizable when fruiting in late spring and early summer, when the female clusters resemble small burs. Each cluster consists of numerous individual sac-like structures, or perigynia, which are about 5-6 mm in length, being broad at their base and tapering to a slender beak-like tip, and enclosing the 3-sided fruits.

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.

PABS

The PA Biological Survey (PABS) considers Yellow Sedge to be a species of special concern, based on the limited number of locations recently confirmed and the very specialized habitat. It has a PA legal rarity status and a PABS suggested rarity status of Threatened.

Habitat

The species grows in fens and limestone-influenced wetlands.

Survey Dates

Fruits June - August

Distribution

Yellow Sedge has a transcontinental range across the cooler regions of North America. In Pennsylvania, it is considered a northern species, and has been documented historically in the glaciated northwestern and northeastern counties.

Yellow

Management

The viability of populations of Yellow Sedge and its habitat may be enhanced by creating buffers and protecting the natural hydrology around wetlands and controlling invasive species.

Conservation Status Map

Yellow

Map Legend

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

  • NatureServe. 2018. NatureServe Explorer: An online encyclopedia of life [web application]. Version 7.1. NatureServe, Arlington, Virginia. Available at http://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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