Packera glabella (formerly Senecio glabellus) is one of several plants with the common name butterweed. P. glabella has also been called cressleaf groundsel and yellowtop. It is native to central and southeastern North America but spreads so aggressively, overtaking other native plants, that it is considered a noxious weed in Ohio (a designation primarily for agriculture), although the Ohio Invasive Plants does not list the plant on its invasive species list. A 2020 blog post by the Ohio Natural Areas & Preserves Association describes butterweed as "a new invasive species" in Ohio's forested wetlands, noting its rapid spread and impact on native plant communities.