Cirsium

genus of plants

Cirsium is a genus of flowering plants in the family Asteraceae. It is one of many genera with the common name being thistles. Other genera known as thistles include Carduus, Cynara, Onopordon, and Silybum.

Cirsium
Spear Thistle Cirsium vulgare, Fort Custer.jpg
Cirsium vulgare
Scientific classification
Kingdom:
(unranked):
(unranked):
(unranked):
Order:
Family:
Asteraceae
Subfamily:
Tribe:
Genus:
Cirsium
Species

About 200;[1] see text

Cirsium arvense

They are mostly native to Eurasia and northern Africa. There are about 60[1] species in North America (although many species have been naturalized outside their native ranges).

Most species are considered weeds. Cirsium vulgare is listed as a weed in nine US states.[2] Some species are planted in gardens for their beauty and to attract butterflies.

SpeciesEdit

Hybrids
  • Cirsium × canalense - Canal Thistle
  • Cirsium × crassum - Thistle
  • Cirsium × erosum - Glory Thistle
  • Cirsium × iowense - Iowa Thistle
  • Cirsium × vancouverense - Vancouver Thistle

ReferencesEdit

  1. 1.0 1.1 "Cirsium". Flora of North America.
  2. "PLANTS Profile for Cirsium vulgare (bull thistle) USDA PLANTS". USDA Plant Database. USDA. unknown. Retrieved 2008-07-15. Check date values in: |date= (help)