hillii (Canby) B. Boivin - Great Lakes region, upper Mississippi Valley Cirsium pumilum var. (wikipedia.org)
Biota of North America Program 2014 county distribution map, Cirsium pumilum Biota of North America Program 2014 county distribution map, Cirsium hillii Flora of North America, Pasture thistle, Cirsium pumilum (Nuttall) Sprengel, Syst. (wikipedia.org)
Hill's Thistle often goes by Latin name Cirsium hillii but it is now treated as a variety of Cirsium pumilum (Pasture Thistle), var. (minnesotawildflowers.info)
Species4
Cirsium pumilum, the pasture thistle, is a North American species of plants in the tribe Cardueae within the family Asteraceae. (wikipedia.org)
Among the worst invasive species that are present at Hidden Springs wetlands are purple loosestrife ( Lythrum salicaria ), mis-named Canada thistle ( Cirsium arvense ), and reed canarygrass ( Phalaris arundinacea ). (boisefrontnature.com)
Perennial1
Cirsium pumilum is a biennial or perennial herb up to 100 cm (40 inches) tall, blooming once before dying. (wikipedia.org)
White2
Like most native thistles it has a white stripe up the center of the bract. (minnesotawildflowers.info)
Large patches of purple-flowered Canada thistle ( Cirsium arvense ) grow at the edge of the marsh, interspersed with tall stalks of poison-hemlock ( Conium maculatum ) covered with small white flowers. (boisefrontnature.com)