Packera glabella

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 invasive. Further, when eaten, it is toxic to humans and highly toxic to horses & cattle. Authorities recommend eradicating it, conventionally with 2,4-D (which dissipates completely from the soil within 2 weeks).[5]

Packera glabella involucres

Packera glabella
Butterweed

Secure  (NatureServe)[1]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Packera
Species:
P. glabella[2]
Binomial name
Packera glabella[2]
Synonyms
  • Senecio glabellus Pior.
  • Senecio lobatus Pers.[3]
  • Senecio carolinianus Spreng.
  • Senecio densiflorus Mart.
  • Senecio lobatus Pers.
  • Senecio lyratus Michx.
  • Senecio mississipianus DC.[4]

Distribution

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.

Native
Nearctic:
Northeastern U.S.A.: Indiana
North-Central U.S.A.: Illinois, Kansas, Missouri, Nebraska, Oklahoma
Southeastern U.S.A.: Alabama, Arkansas, Florida, Georgia, Kentucky, Louisiana, Mississippi, North Carolina, South Carolina, Tennessee
South-Central U.S.A.: Texas

Conservation

NatureServe lists Packera glabella as Secure (G5) worldwide and Critically Imperiled (S1) in Nebraska, Imperiled (S2) in Kansas, and Vulnerable (S3) in North Carolina.[1]

References
  1. NatureServe (5 February 2021). "Packera glabella - Butterweed". NatureServe Explorer (explorer.natureserve.org). Arlington, Virginia: NatureServe. Retrieved 12 February 2021.
  2. Natural Resources Conservation Service (NRCS). "PLANTS Profile, Packera glabella (Poir.) C. Jeffrey". The PLANTS Database. United States Department of Agriculture. Retrieved 22 April 2008.
  3. Integrated Taxonomic Information System Organization (ITIS) (1999). "Packera glabella (Poir) C. Jeffrey". Integrated Taxonomic Information System on-line database. Retrieved 1 April 2008.
  4. Flora of North America. "22. Packera glabella (Poiret) C. Jeffrey, Kew Bull. 47: 101. 1992". 20: 548, 575, 585, 588, 601. Retrieved 22 April 2008. {{cite journal}}: Cite journal requires |journal= (help)
  5. Germplasm Resources Information Network (GRIN) (3 May 2007). "Taxon: Packera glabella (Poiret) C. Jeffrey". Taxonomy for Plants. USDA, ARS, National Genetic Resources Program, National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved 22 April 2008.
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