| Author | (L.) Nash | |
| Distribution | Outer Banks/barrier islands, Coastal Plain, Sandhills, and adjacent Piedmont; rare in the upper Piedmont and southwestern Mountains.
Mostly Coastal Plain, NJ to FL, TX, southeastern OK southeastern MO, western TN. | |
| Abundance | Frequent in the lower Coastal Plain and barrier islands; fairly common into the Sandhills, but mostly uncommon in the northwestern Coastal Plain; very rare westward. The website editors suggest a State Rank of S4S5. | |
| Habitat | Fresh and fresh-tidal marshes, interdune marshes, openings in swamp forests, margins of impoundments and bay lakes, river shores. Meadow near Hiwassee River (Cherokee County); ditches (Swain County); muddy shore of Chatuge Lake (Clay County). Often emergent from shallow water. | |
| Phenology | Flowering and fruiting July-October. | |
| Identification | American Cupscale is a perennial, with culms 2.5-4 feet tall. It is readily identified by the dense inflorescence 2-4 inches long and 1/4 as wide, with spikelets that resemble those of some Panicum species. The upper glumes are strongly veined. | |
| Taxonomic Comments | None
| |
| Other Common Name(s) | None | |
| State Rank | S3S4 [S4S5] | |
| Global Rank | G5 | |
| State Status | | |
| US Status | | |
| USACE-agcp | OBL link |
| USACE-emp | OBL link |
