Hill's Thistle
Cirsium pumilum
(formerly Cirsium hillii)

Hill's Thistle (Cirsium pumilum) Other scientific names: Cirsium 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

For more information visit: Ontario Wildflowers

Photographs: 239 photographs available, of which 16 are featured on this page. SCROLL DOWN FOR PHOTOGRAPHS.

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

 Hill's Thistle flower head.

Hill's Thistle (Cirsium pumilum)

Hill's Thistle (Cirsium pumilum)

 Hill's Thistle flower atop its stem.

Hill's Thistle (Cirsium pumilum)

 An entire Hill's Thistle plant.

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

 Detail of the bracts on the flower head.

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

 Flower head before opening.

Hill's Thistle (Cirsium pumilum)

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

Hill's Thistle (Cirsium pumilum)

 Hill's Thistle flower head in bud.

Hill's Thistle (Cirsium pumilum)

 Detail of a leaf.

Hill's Thistle (Cirsium pumilum)

 Basal rosette of Hill's Thistle leaves.

Hill's Thistle (Cirsium pumilum)

Hill's Thistle (Cirsium pumilum)

 Another rosette.

Hill's Thistle (Cirsium pumilum)

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

Hill's Thistle (Cirsium pumilum)

 Hill's Thistle Seeds.

Hill's Thistle (Cirsium pumilum)

 Hill's Thistle going to seed.

Hill's Thistle (Cirsium pumilum)

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

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