| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Poaceae | Chasmanthium latifolium | River Oats, Fish-on-a-Stringer, 'Inland Sea Oats' | Riverbanks, streambanks, bottomland forests, seepages and glades over mafic or calcareous rock, usually in nutrient-rich soils, also now cultivated widely as a native plant ornamental, but can be quite aggressive. | NJ, OH, IL, and KS south to ne. and Panhandle FL and TX. |  (c) Campos, Aidan |
| Poaceae | Chasmanthium laxum | Slender Spikegrass | Savanna-pocosin ecotones, sandhill-pocosin ecotones, moist hardwood swamps, other moist habitats. | S. NY, KY, and OK south to s. FL and e. TX. |  (c) Fleming, Gary P. |
| Poaceae | Chasmanthium nitidum | Shiny Spanglegrass | Blackwater swamp forests, especially with calcareous influence (over marl, oligohaline tidal swamps). | Se. NC south to s. FL and west to se. AL. |  (c) Bradley, Keith |
| Poaceae | Chasmanthium ornithorhynchum | Birdbill Spikegrass | Blackwater swamp forests. | S. AL and w. FL Panhandle west to e. LA (Florida Parishes). Also reported for NC and SC (FNA 2003a; Kartesz 2020), apparently in error, as no evidence has been found to support a distribution in the Carolinas. |  (c) Berger, Matt - CC-BY |
| Poaceae | Chasmanthium sessiliflorum var. 1 | Coastal Hammock Longleaf Spikegrass | Calcareous hammocks. | E. SC south to n. FL. |  (c) Flood, Melanie |
| Poaceae | Chasmanthium sessiliflorum var. sessiliflorum | Longleaf Spikegrass | Moist to dryish hardwood forests, swamps, other moist habitats. | Se. VA, n. TN, n. AR, and e. OK south to sc. peninsular FL and ec. TX. |  (c) Bradley, Keith |