Eupatorium rotundifolium var. rotundifolium
Leaf blades 3-nerved from bases, 20–43 × 13–35 mm, broadest near bases, bases broadly subtruncate to broadly cuneate, margins crenate. 2n = 20, 30.
Phenology: Flowering Jul–Aug.
Habitat: Moist, low ground, roadsides, margins of ponds, sandy soils
Elevation: 10–200+ m
Ala., Ark., Del., Fla., Ga., Ind., Ky., La., Md., Mass., Miss., N.J., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Va., W.Va.
Variety rotundifolium includes both sexual diploids and apomictic polyploids, which are morphologically not distinguishable. The sexual diploids are somewhat more restricted geographically, occurring in a band across northern Florida and southern Georgia.