| Author | Walter | |
| Distribution | Coastal Plain, Sandhills, and lower Piedmont; upper Piedmont and low Mountains. The gap in the central Piedmont is clearly real.
MA and NY to KY, south to FL and southeastern LA. | |
| Abundance | Common to locally abundant in the Coastal Plain; fairly common to common in the lower Piedmont. Infrequent to locally fairly common in the Piedmont foothills and lower Mountains, but very rare in the middle and higher elevations and (oddly) the central Piedmont. The NCNHP's rank of S4 is conservative; it actually is S5 rank in the state. | |
| Habitat | Wet to moist Longleaf Pine-Wiregrass savannas and flatwoods, pocosin ecotones, blackwater streamheads and ecotones, damp meadows, wet powerlines, montane seepage bogs, interdune marshes. | |
| Phenology | Flowering and fruiting August-October. | |
| Identification | Rough Boneset is a wetland species that usually grows 2-3 feet tall and resembles Roundleaf Thoroughwort (E. rotundifolium), but is distinct in several characters. The middle and upper leaves are noticeably reduced in size (vs. about the same size throughout); leaves are ovate to triangular and bluntly pointed in outline (vs. rotund and without a point); and leaves have very short but distinct leafstalks (vs. none). Also, the leaves on some plants are strongly ascending as opposed to horizontally arranged. In combination, these characters give it a very different gestalt in the field than any of our eupatoriums, making it easy to identify. | |
| Taxonomic Comments | In some older texts, treated as a variety of Roundleaf Thoroughwort, clearly a mistake.
| |
| Other Common Name(s) | Rough Eupatorium, Rough Thoroughwort | |
| State Rank | S4 [S5] | |
| Global Rank | G5 | |
| State Status | | |
| US Status | | |
| USACE-agcp | FACW link |
| USACE-emp | FACW link |
