Robert W. Freckmann Herbarium

  Cirsium hillii (Canby) Fernald image
Photographer: Mark Mittelstadt           

Botanical Illustration

Kitty Kohout

Merel R. Black

Josh Sulman

Thomas A. Meyer
Family Asteraceae
Cirsium hillii (Canby) Fernald
Hill's thistle, hollow-rooted thistle, prairie thistle
Cirsium: derived from the Greek kirsion, "a kind of thistle;" also cirsos meaning "a swollen vein" for which thistle was once a remedy
hillii: for Ellsworth Jerome Hill (1833-1917)
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Threatened
Plant: erect, biennial/(perennial?), 1'-3' tall, spiny, sweet smelling forb with thick, hollow roots
Flower: head 1 1/2"-2" wide with purple disk flowers; inflorescence usually solitary or a few heads; blooms June-Aug.
Fruit:dry seed on fluffy, feathery-divided pappus
Leaf:basal leaves often edged with red and in a large, persistent rosette
Habitat: sun; prairies; in sandy soil

More Information Natural Communities Herbarium Specimens
All Cirsium list Google- Images or Text

Flora of North America (off site)
Cirsium pumilum (Nutt.) Spreng. subsp. hillii (Canby) R.J.Moore & Frankton
Cirsium pumilum (Nutt.) Spreng. var. hillii (Canby) B.Boivin
Cnicus hillii Canby

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