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 an invasive species or noxious weed in multiple states including Ohio. The Ohio Invasive Plants Council specifically describes butterweed as "a new invasive species" in Ohio's forested wetlands, noting its rapid spread and impact on native plant communities.

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