Coefficient of Conservatism:
Coefficient of Wetness:
B. S. Walters
Panicum perlongum of Michigan Flora.
Dry prairies and fields.
An uncommon species with us, not always clearly distinguished from the common D. depauperatum and D. linearifolium. Some plants have a few of the spikelets longer than usual for D. perlongum, and ± beaked, suggesting the possibility of hybridization with D. depauperatum, although the broad spikelets and narrow panicle are as in typical D. perlongum; others have all blunt spikelets of the right length for D. perlongum, but these are narrow (not over 1.5 mm wide) and the panicle is open. Stephenson (1984) considered D. perlongum as an intermediate between D. depauperatum and D. linearifolium, but the species is recognized by Freckmann & Lelong (2002). In view of its fairly consistent occurrence in dry prairies, we also retain it. An 1894 Keweenaw Co. collection by O. A. Farwell is suspect and not mapped.