Species Factsheets

Dichanthelium oligosanthes

Heller's Witchgrass

View as PDF

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

Global Rank: G5 rank interpretation
State Rank: S3

Dichanthelium oligosanthes

Description

Heller's Witchgrass is a perennial clump or bunch grass that may grow to 60 cm in height, but is often much shorter. The leaves are alternately arranged, consisting of a basal sheathing portion, which often has a purplish tinge and is frequently hairy, that envelopes the stem and a lance shaped, flattened, and untoothed blade that is 5-13 cm in length and about 12 mm in width, pointed at the tip, and usually somewhat hairy on the lower side. The flowers, appearing first in June and July, and again later in the fall, occur in a compactly-branched inflorescence containing many individual broadly-ovoid spikelets that are about 3-4 mm long and have, at least compared to many of other species in the genus Dichanthelium, relatively thick veins running from top to bottom. There are many species of panic-grass in Pennsylvania, and they are difficult to identify since they mostly require the use of microscopic features to distinguish the species; in general, this species has a combination of relatively broad leaves, prominently-veiny and rounded spikelets, and compact inflorescences.

Rank Justification

Vulnerable in the nation or state due to a restricted range, relatively few populations (often 80 or fewer), recent and widespread declines, or other factors making it vulnerable to extirpation.

Habitat

It grows in open, sunny places, such as grasslands, fields, thickets, and rocky openings, especially on well-drained serpentine, limestone and diabase substrates.

Survey Dates

Vernal terminal panicles May - early July, or late summer or early fall

Distribution

Heller's Witchgrass has a transcontinental range across North America. In Pennsylvania, it has been documented historically mostly in the southeastern counties.

Heller's

Management

The viability of populations of Heller's Witchgrass often requires maintaining early successional conditions and controlling invasive species. Active management, such as periodic mowing or prescribed fire, may be needed to create the proper successional stage and ecological conditions for this species to thrive. Quarrying and habitat loss are threats in some locations.

Conservation Status Map

Heller's

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