| Author | (L.) Britton | |
| Distribution | Mostly Coastal Plain; fairly well distributed in the Mountains, but only scattered in the Piedmont. Seemingly absent in the east-central Piedmont.
Lab. to B.C. south to FL, TX, and CA. | |
| Abundance | Common in the Coastal Plain and adjacent northeastern Piedmont; uncommon and scattered in the Piedmont; infrequent to frequent in the Mountains. | |
| Habitat | Swamp forests, small stream swamps, beaver ponds, marshes, wet roadside ditches, montane bogs. |
| Phenology | Flowering and fruiting July-October. | |
| Identification | Plants are clonal from elongate rhizomes, with the stems mostly 1-2 feet tall. The lower leaves are reduced to bladeless sheaths. Viewed from directly above, the middle and upper leaves are strictly 3-ranked (in 3 rows vertically), a distinct feature. The flowers occur in the upper part of the stem, from leaf bases, the spilkelets being slender and brownish. Not surprisingly, this quite distinctive species (at least when viewed from above!), is in its own genus. | |
| Taxonomic Comments | Technically, our plants are var. arundinaceum; var. boreale occurs in Quebec.
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| Other Common Name(s) | None | |
| State Rank | S5 | |
| Global Rank | G5 | |
| State Status | | |
| US Status | | |
| USACE-agcp | OBL link |
| USACE-emp | OBL link |
