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.

recommend eradicating it, conventionally with 2,4-D (which dissipates completely from the soil within 2 weeks).

[5] Butterweed is found from Texas north to South Dakota and east to Ohio with a disjunct population in Delaware.

It grows in clay and loam soils in disturbed areas and in prairie and floodplain habitats.

NatureServe lists Packera glabella as Secure (G5) worldwide and Critically Imperiled (S1) in Nebraska, Imperiled (S2) in Kansas, and Vulnerable (S3) in North Carolina.