Panicum philadelphicum
Philadelphia panic-grass

Key Characteristics

Slender annual grass of alvar; leaves, often crowded basally, are yellowish-green and narrow (2-6 mm) with hairy sheaths and internodes; panicles about 1/4 the total length of plant, with small (2 mm) glabrous spikelets.

Status and Rank

  • State Status: T
  • State Rank: S2
  • Global Rank: G5?

Occurrences

County NameNumber of OccurrencesYear Last Observed
Chippewa11995
Distribution map for Panicum philadelphicum

Updated 1/31/2017. Information is summarized from MNFI's database of rare species and community occurrences. Data may not reflect true distribution since much of the state has not been thoroughly surveyed.

Habitat

This species is known only from thin soil in alvar habitat on Drummond Island.

Natural Community Types

Methodology

For each species, lists of natural communities were derived from review of the nearly 6,500 element occurrences in the MNFI database, in addition to herbarium label data for some taxa. In most cases, at least one specimen record exists for each listed natural community. For certain taxa, especially poorly collected or extirpated species of prairie and savanna habitats, natural community lists were derived from inferences from collection sites and habitat preferences in immediately adjacent states (particularly Indiana and Illinois). Natural communities are not listed for those species documented only from altered or ruderal habitats in Michigan, especially for taxa that occur in a variety of habitats outside of the state.

Natural communities are not listed in order of frequency of occurrence, but are rather derived from the full set of natural communities, organized by Ecological Group. In many cases, the general habitat descriptions should provide greater clarity and direction to the surveyor. In future versions of the Rare Species Explorer, we hope to incorporate natural community fidelity ranks for each taxon.

Feel free to send questions and comments to Brad Slaughter at slaugh14@msu.edu.

Associated Plants

The limited data from the sole Michigan collection site noted sheathed rush grass, false pennyroyal and other annuals.

Management

Requires protection of the habitat and perpetuation of natural disturbance (i.e. prescribed fire, wind throw, etc.) and hydrological regimes. Since alvar is primarily a sedge and grass dominated community, species found in this community usually do not tolerate later stages of succession and require management that prevents woody plant encroachment, such as prescribed burns or brush removal. This species is susceptible to damage from excessive recreational use and foot traffic.

General Survey Guidelines

Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgement of the investigator.

Survey Methods

Page Citation

Michigan Natural Features Inventory. 2007. Rare Species Explorer (Web Application). Available online at http://mnfi.anr.msu.edu/explorer [Accessed Mar 30, 2017]

References

Survey References

Technical References