Canadian Wildlife Service

Fisheries and Oceans Canada

Lake Huron Centre for Coastal Conservation

Natural Heritage Information Centre

Ministry of Natural Resources

Ontario Parks

Awenda Provincial Park

Inverhuron Provincial Park

MacGregor Provincial Park

Misery Bay Provincial Park

Pinery Provincial Park

Point Farms Provincial Park

Wasaga Beach Provincial Park

Friends of Awenda

The Friends of MacGregor Point Park

The Friends of Misery Bay

The Friends of Pinery Park

Friends of Pukaskwa National Park

Friends of Wasaga Beach

Parks Canada

Pukaskwa National Park

Species at Risk

Royal Ontario Museum

Ontario Species at Risk

Trent University

University of Guelph

World Wildlife Fund

Sources Outside of Canada

Bourne of the Wind

Michigan Natural Features Inventory

Pitcher's Thistle Recovery Plan (US)

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Author of www.pitchersthistle.ca: Jarmo Jalava, 2005

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