| Section 6 » Order Asterales » Family Asteraceae |
Show/Hide Synonym
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| Eupatorium rotundifolium | = | Eupatorium rotundifolium var. rotundifolium | Gleason and Cronquist (1991) | | | Eupatorium rotundifolium | = | Eupatorium rotundifolium var. rotundifolium | Flora of North America (1993b, 1997, 2000, 2002a, 2002b, 2003a, 2004b, 2005, 2006a, 2006b, 2006c, 2007a, 2009, 2010) | | | Eupatorium rotundifolium | = | Eupatorium rotundifolium var. rotundifolium | Gleason (1952) | | | Eupatorium rotundifolium | = | Eupatorium rotundifolium var. rotundifolium | Kartesz (1999) | | | Eupatorium rotundifolium | = | Eupatorium rotundifolium var. rotundifolium | | | | Eupatorium rotundifolium | = | Eupatorium rotundifolium var. rotundifolium | Radford, Ahles, and Bell (1968) | | | Eupatorium rotundifolium | = | Eupatorium rotundifolium var. rotundifolium | Vascular Flora of the Southeastern States (Cronquist 1980, Isely 1990) | | | Eupatorium rotundifolium | = | Eupatorium rotundifolium var. rotundifolium | Wofford (1989) | | | Eupatorium rotundifolium | < | Eupatorium rotundifolium | Godfrey and Wooten (1979, 1981) | | | Eupatorium rotundifolium | < | Eupatorium rotundifolium | | | | Eupatorium rotundifolium | | Eupatorium rotundifolium ssp. rotundifolium | | | | Source: Weakley's Flora |
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| Author | L. | |
| Distribution | Coastal Plain, Sandhills, and lower Piedmont. Records from the central and upper Piedmont and the low Mountains could do with an ID check vs. E. pubescens, which has been split out from E. rotundifolium. In fact, most of the SERNEC specimens from the western Piedmont and Mountains tend to look more like E. pubescens owing to the ovate leaf shape, as do most photos on iNaturalist from the western half of the state.
NY to IN and OK, south to southern FL and TX. | |
| Abundance | Common to locally abundant throughout the Coastal Plain, Sandhills, and eastern Piedmont. Its status in the central and western Piedmont and Mountains needs to be verified. | |
| Habitat | Moist to mesic or dry Longleaf Pine-Wiregrass uplands, savannas, flatwoods, pea swales; blackwater streamhead ecotones, pocosin/savanna ecotones; montane seepage bogs, slope seepages, meadows. In the Piedmont in fields, powerline clearings, wooded borders, and other rather weedy places. | |
| Phenology | Flowering and fruiting August-October. | |
| Identification | Roundleaf Thoroughwort is readily identified by its sessile (stalkless), paired leaves and rotund leaf shape. The branched inflorescence and white heads are much like other thoroughworts. Hairy Thoroughwort (E. pubescens) is very closely related, but it grows taller (up to a foot more), and the leaves have an olive-green tone, rather than gray-green or plain green. In addition, leaf margins are generally sharply toothed vs. crenate (low, rounded teeth) in Roundleaf Thoroughwort and the rather ovate leaf shape rather than rotund. Note the absence of Hairy Thoroughwort in nearly all of the Coastal Plain. Rough Boneset (E. pilosum) often grows with Roundleaf Thoroughwort in moist soils; its leaves have short but distinct stalks, are ovate to triangular shaped and short-tapered to a blunt point. | |
| Taxonomic Comments | See Hairy Thoroughwort; it is treated by some as a variety of Roundleaf Thoroughwort.
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| Other Common Name(s) | Roundleaf Boneset, Roundleaf Eupatorium | |
| State Rank | S5 | |
| Global Rank | G5 | |
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| US Status | | |
| USACE-agcp | FAC link |
| USACE-emp | FAC link |
