Hill's Thistle (Cirsium pumilum) - Ontario Wildflowers

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

Photographs: 239 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 pumilum)
Photograph by K Sayers

Hill's Thistle flower head.

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)

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.

Wildflowers ● Thistles

Range map for Hill's Thistle (Cirsium pumilum)

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)

Hill's Thistle Cirsium pumilum(formerly Cirsium hillii)

Hill's Thistle
Cirsium pumilum
(formerly Cirsium hillii)