Cirsium pitcheri (Pitcher Thistle, Dune Thistle)


Botanical Information

FamilyAsteraceae
GenusCirsium
Speciespitcheri
CategoryPerennials, Wildflowers & Weeds
ReferencesCOSEWIC. 2010. COSEWIC assessment and status report on the Pitcher’s Thistle Cirsium pitcheri in Canada. Committee on the Status of Endangered Wildlife in Canada. Ottawa. x + 32 pp. (www.sararegistry.gc.ca/status/status_e.cfm).
OriginNorth America including Ontario, Michigan, Indiana, Illinois and Wisconsin.

Details

USDA Hardiness Ref.
Canada Hardiness Ref.
RHS Hardiness Ref.
GrowthSlow
Flowering PeriodJune, July

Description and Growing Information

General DescriptionA monocarpic herb that matures over a period from 3-11 years. It is ranked as nationally imperilled in Canada and Threatened in the United States of America.
PropagationBy seed which appears viable for a period of three years, no known means of vegetative propagation exists.
PestsProne to browsing by White-tailed Deer, Snowshoe Hare and Canada Goose.
Notable SpecimensPukaskwa National Park of Canada, Heron Bay, Ontario, Canada.
HabitatPitcher Thistle is found in dune grassland communities dominated by Marram Grass (Ammophila breviligulata), Long- leaved Sand Reed (Calamovilfa longifolia var. magna), Great Lakes Wheat-grass (Elymus lanceolatus spp. psammophilus) or Little Bluestem (Schizachyrium scoparium).
Flower DescriptionClusters of spiny, urn shaped, creamy white to pink thistle-like flowers in early to mid-summer
Fruit DescriptionThe seed is shiny and dark brown with a papas attached to assist in dispersal.

Photographs