Plants and Animals
Panicum philadelphicum Philadelphia panic-grass
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
US Status: No Status/Not Listed
State Status: T - Threatened (legally protected)
Global Rank: G5? - Secure (inexact)
State Rank: S2 - Imperiled
|County||Number of Occurrences||Year Last Observed|
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.
This species is known only from thin soil in alvar habitat on Drummond Island.
Natural Community Types
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.
The limited data from the sole Michigan collection site noted sheathed rush grass, false pennyroyal and other annuals.
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.
Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgement of the investigator.
Survey Period: From first week of August to fourth week of September
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- Gray, A. 1950. Gray's Manual of Botany; eighth ed. Van Nostrand Reinghold, New York. 1632pp.
- Hitchcock, A. S. 1951. Manual of the Grasses of the United States. Second ed. Revised by A. Chase. U.S. Department of Agriculture Miscellaneous Publications 200. 1051pp.
- Holmgren, N.H. 1998. Illustrated Companion to Gleason and Cronquist's Manual. Illustrations of the vascular plants of Northeastern United States and adjacent Canada. New York Botanical Garden, Bronx. 937pp.