Senecio_glabellus
Packera glabella
Species of plant in the family Asteraceae native to the United States
Packera glabella (formerly Senecio glabellus) is one of several plants with the common name butterweed, this one 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[by whom?] invasive. Further, when eaten, it is toxic to humans and highly toxic to horses & cattle. Authorities[who?] recommend eradicating it, conventionally with 2,4-D (which dissipates completely from the soil within 2 weeks).[5]