| Author | (L.) A.S. Hitchcock | |
| Distribution | Mountains and upper Piedmont; middle and outer Coastal Plain, including the Outer Banks. Scattered in the central and lower Piedmont, and rare in the Sandhills. Clearly a bimodal range in NC, scarce in the middle of the range.
MA to OH and MO, south to northern FL and LA. | |
| Abundance | Fairly common to frequent in the Mountains, northern Piedmont, and most of the Coastal Plain; rare to uncommon in much of the central and southern Piedmont and Sandhills. Though the NCNHP has this ranked as S3, with collections from nearly 60% of the state's counties this is clearly an S5 species. | |
| Habitat | Swamp forests of various composition (including maritime), bogs, openings in peatlands, interdune marshes, peaty margins of blackwater streams. | |
| Phenology | Flowering and fruiting April-June. Plants senesce quickly and then are difficult to find. | |
| Identification | Swamp Wedgescale is similar to Shiny Wedgescale (S. nitida), but taller (2-3 feet vs. 1-2 feet), and the upper lemmas have a distinct awn 3-9 mm long (vs. none or rarely up to 1 mm long in that species). The inflorescence is pale green or yellowish green. | |
| Taxonomic Comments | In some older texts, treated as Trisetum pensylvanicum.
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| Other Common Name(s) | Swamp Oats | |
| State Rank | S3 [S5] | |
| Global Rank | G4 [G5] | |
| State Status | | |
| US Status | | |
| USACE-agcp | OBL link |
| USACE-emp | OBL link |
