CPC Plant Profile: Hill's Thistle
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Plant Profile

Hill's Thistle (Cirsium pumilum var. hillii)

Description
  • Global Rank: G3 - Vulnerable
  • Legal Status: N/A
  • Family: Asteraceae
  • State: IA, IL, IN, MI, MN, ON, WI
  • Nature Serve ID: 140937
  • Date Inducted in National Collection: 04/01/1990

Participating Institutions
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Updates
Nature Serve Biotics
  • 05/02/2017

Approximately 400 occurrences are scattered through a range centered around the Great Lakes, from southern Ontario through Michigan, Wisconsin, Minnesota, Iowa, Illinois, and northern Indiana; additional populations are likely to be found through ongoing inventory. Although around 100 known occurrences are thought to have excellent or good viability, many nevertheless contain small numbers of reproductive plants; the total reproductive population may not be more than 3500-4000 individuals. Thought to have declined significantly from likely historic distribution and to still be declining currently. The primary threat is habitat loss/degradation, due to conversion for agriculture and development and to fire suppression which contributes to canopy closure and litter build-up, reducing habitat suitability. Active management (e.g. prescribed fire) may be necessary to ensure long-term persistence.

  • 01/01/2010

The DNR's domographic plot contained 2 flowering plants, 25 sterile plants and many uncounted seedlings the largest concentration is found in the central northern Lower Peninsula of Michigan

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Photos
Nomenclature
Taxon Cirsium pumilum var. hillii
Authority (Canby) B. Boivin
Family Asteraceae
CPC Number 956
ITIS 533629
USDA CIPUH2
Common Names Hill's Thistle
Associated Scientific Names Cirsium hillii | Cirsium pumilum ssp. hillii
Distribution NA
State Rank
State State Rank
Iowa S1
Illinois S1
Indiana S1
Michigan S3
Minnesota S3
Ontario S3
Wisconsin S3
Habitat

Prairie and other open areas with dry sandy soil

Ecological Relationships

Pollinators
Common Name Name in Text Association Type Source InteractionID
Bees
Bumble bees Bombus pensylvanica Confirmed Pollinator Link
Bumble bees Psithyrus variabilis Confirmed Pollinator Link
Leaf-cutting bees Megachile montivaga Confirmed Pollinator Link
Leaf-cutting bees Megachile pugnatus Confirmed Pollinator Link
Reintroduction
Lead Institution State Reintroduction Type Year of First Outplanting

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