Species Factsheets

Poa autumnalis

Autumn Bluegrass

View as PDF

State Status: Pennsylvania Endangered (PE)
PBS Status: Pennsylvania Endangered (PE)
Federal Status:

Global Rank: G5 rank interpretation
State Rank: S1

Did You Know?

Despite the common name, Poa autumnalis flowers and fruits in spring.

Poa paludigena

Description

Autumn bluegrass (Poa autumnalis) is a perennial herb with a slender hairless stem that may grow to 60cm in height. The leaves are alternately arranged, linear in shape, not toothed on the margin, parallel-veined, up to 15cm in length and 2-3mm in width, and pointed at the tip. The flowers, appearing in May and June, are individually only a few millimeters in length. They are grouped in an open branched cluster at the top of the stem, with the main lower branches of the cluster tending to be arranged in pairs or occurring singly along the stem. Despite the common name, this species flowers and fruits in spring.

Rank Justification

Critically imperiled in the nation or state because of extreme rarity (often 5 or fewer occurrences) or because of some factor(s) such as very steep declines making it especially vulnerable to extirpation from the state.

PABS

The PA Biological Survey (PABS) has assigned autumn bluegrass a rarity status of Endangered, based on the relatively few populations that are documented and the small state range.

Habitat

Autumn Bluegrass grows in moist woods and on streambanks and slopes.

Survey Dates

Flowers late May - June

Distribution

In Pennsylvania, it has been documented historically in several southeastern counties.

Autumn

Threats

Some populations are threatened by habitat loss and exotic species.

Conservation Status Map

Autumn

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.
PNHP is a partnership between The Department of Conservation and Natural Resources,
the Pennsylvania Game Commission, the Pennsylvania Fish and Boat Commission,
and the Western Pennsylvania Conservancy.
DCNR Home Page
PA Game Commission Home Page
PA Fish and Boat Commission Home Page
Western PA Conservancy Home Page
DCNR Home Page PNHP | Forestry Home | Contact Us | Search This Site
© 2019 PA Department of Conservation and Natural Resources
DCNR Home Page