Ontario Wildflowers website

Hill's Thistle
(Cirsium hillii)

Hill's Thistle (Cirsium hillii) Other scientific names: Carduus hillii, Cirsium pumilus, Cnicus hillii

French names: Chardon de Hill

Family: Composite Family (Asteraceae)

Group: Thistles

Similar species:
  •   Field Thistle (Cirsium discolor)
  •   Swamp Thistle (Cirsium muticum)

Flowers: Summer;  Blue/Violet;  Indistinguishable parts (petals)

Leaves: Alternate, Simple

Habitat: Fields and Open Areas

Native/Non-native: Native

Photographs: 160 photographs available, of which 16 are featured on this page. SCROLL DOWN FOR PHOTOGRAPHS.

Range Map is at the bottom of the page
  

Wildflowers       Thistles

Hill's Thistle (Cirsium hillii)
Photograph by K Sayers

 Hill's Thistle flower head.

Hill's Thistle (Cirsium hillii)

Hill's Thistle (Cirsium hillii)

 Hill's Thistle flower atop its stem.

Hill's Thistle (Cirsium hillii)

 An entire Hill's Thistle plant.

Hill's Thistle (Cirsium hillii)
Photograph by K Sayers

 Detail of the bracts on the flower head.

Hill's Thistle (Cirsium hillii)
Photograph by K Sayers

 Flower head before opening.

Hill's Thistle (Cirsium hillii)

 Flower head just emerging from rosette of leaves, in mid-June.

Hill's Thistle (Cirsium hillii)

 Hill's Thistle flower head in bud.

Hill's Thistle (Cirsium hillii)

 Detail of a leaf.

Hill's Thistle (Cirsium hillii)

 Basal rosette of Hill's Thistle leaves.

Hill's Thistle (Cirsium hillii)

Hill's Thistle (Cirsium hillii)

 Another rosette.

Hill's Thistle (Cirsium hillii)

 Hill's Thistle inits preferred habitat - open alvar-ish fields, often along with Jack Pine (Pinus banksiana).

Hill's Thistle (Cirsium hillii)

 Hill's Thistle Seeds.

Hill's Thistle (Cirsium hillii)

 Hill's Thistle going to seed.

Hill's Thistle (Cirsium hillii)

 Spent Hill's Thistle seed head from the previous year.
  

Wildflowers       Thistles

Range map for Hill's Thistle (Cirsium hillii)

PLEASE NOTE: A coloured Province or State means this species occurs somewhere in that Province/State.
The entire Province/State is coloured, regardless of where in that Province/State it occurs.

(Range map provided courtesy of the USDA website and is displayed here in accordance with their Policies)

 

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