| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|
| Poaceae | Glyceria acutiflora | | Shallow water and wet mucky soils in mountain ponds, sinkhole ponds, acid seeps, and wet pastures. | ME west to MI, south to DE, VA, nw. GA (Jones & Coile 1988), e. TN, and MO; e. Asia. | 
|
| Poaceae | Glyceria arkansana | Arkansas Mannagrass | Swamps. | IL south to LA, AR, and e. TX. | 
|
| Poaceae | Glyceria borealis | Small Floating Mannagrass, Northern Mannagrass | Shallow water, wet places. | NL west to AK, south to n. NJ, PA, n. OH, IN, n. IL, IA, NE, NM, AZ, CA, and Mexico (CHH, SON). | 
|
| Poaceae | Glyceria canadensis | Rattlesnake Mannagrass | Bogs, seepages, montane depression ponds, and wet meadows. | NL (Newfoundland) west to MN, south to NJ, VA, nw. NC, and IL. | 
|
| Poaceae | Glyceria declinata | | Disturbed moist areas. | Native of Europe. Documented for Alleghany County, NC (D. Poindexter, pers. comm. 2009) | 
|
| Poaceae | Glyceria fluitans | Water Mannagrass | Shallow water of lakes, pools, slow-moving streams. | Native of Eurasia. | |
| Poaceae | Glyceria grandis var. grandis | American Mannagrass | Wet, mucky soils of open wetlands. | NS west to AK, south to VA, IA, NM, and OR. Attributed to w. NC by Tucker (1996) and to Haywood County, NC (Kartesz 2022). | 
|
| Poaceae | Glyceria laxa | Lax Mannagrass | Bogs, fens, seeps, wet meadows. | PE south to NC, mostly Appalachian. | 
|
| Poaceae | Glyceria melicaria | Slender Mannagrass, Melic Mannagrass | Bogs, seeps, marshes, mountain seepage swamps. | NS west to QC, south to n. GA (Jones & Coile 1988) and KY. | 
|
| Poaceae | Glyceria nubigena | Smoky Mountain Mannagrass | Moderate to high elevation seepages in the Great Smoky Mountains, sometimes in areas appearing dry (such as heath balds), nearly endemic to Great Smoky Mountains National Park. | Endemic to the Great Smoky Mountains of w. NC and e. TN. G. nubigena has nearly the same range as Rugelia nudicaulis, but is more restricted to seepage. | 
|
| Poaceae | Glyceria obtusa | Coastal Mannagrass | Blackwater swamp forests, streamhead pocosins, wet meadows, freshwater marshes, in a wide variety of peaty, acidic soils. | NS south to SC, on or near the Coastal Plain; disjunct to w. VA in Shenandoah Valley sinkhole ponds. | 
|
| Poaceae | Glyceria septentrionalis | Floating Mannagrass, Eastern Mannagrass | Shallow water, wet mucky soils, floodplain sloughs, cypress ponds. | MA west to MN, south to SC, ne. GA, and TX. | 
|
| Poaceae | Glyceria striata var. striata | Fowl Mannagrass | Wet meadows, seepages, bogs, marshes, swamp forests, freshwater tidal marshes, bottomland forests in mesic soils. | NL (Newfoundland) west to BC, south to FL, CA, and to c. Mexico. | 
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| Poaceae | Glyceria striata var. stricta | | Wet meadows. | NL (Labrador) west to AK, south to Long Island (?), IL, IA, SD, and n. Mexico (?). | |