| Author | Michaux | |
| Distribution | Throughout the state, but scarce on Outer Banks.
N.S. to southern MN and NE, south to FL and TX; adventive westward. | |
| Abundance | Frequent to common; rare on the Outer Banks. | |
| Habitat | Moist to wet shores of ponds and impoundments, beaver ponds, roadside ditches, river shores and sandbars, alluvial deposits; sometimes also weedy in drier soils of fallow fields and other disturbed sites. | |
| Phenology | Flowering and fruiting July-October. | |
| Identification | Lower portions of stems of Fall Panicgrass normally recline and root at nodes. Mid and upper portions are much-branched, ascending, and produce inflorescences 6 inches to a foot long, with several spikelets along branchlets. The plants are glabrous (without noticeable hairs). Differs from var. puritanorum by overall greater size and larger spikelets (2.2-3.8 mm vs. 1.8-2.2). | |
| Taxonomic Comments | The genus Panicum in the broad sense was once very large, but with the split of Dichanthelium in the 1980s, it has been reduced to manageable size. In more recent decades, other genera have been split off: Coleataenia, Hymenachne, Kellochloa, and Phanopyrum, as examples. All 6 of these genera can be readily told from each other in the field with just a hand lens. For a more detailed discussion, see the introductory paragraphs in Weakley (2018). | |
| Other Common Name(s) | | |
| State Rank | [S5] | |
| Global Rank | G5T5 | |
| State Status | | |
| US Status | | |
| USACE-agcp | | |
| USACE-emp | | |
