Champaign County Forest Preserve District
Chicago Botanic Garden
Chicago Park District
Chicago Wilderness
Citizens for Conservation
Crab Orchard National Wildlife Refuge
Cypress Creek National Wildlife Refuge
Embarras Volunteer Stewards
Forest Preserve District of DuPage County
Friends of Giant City
Grand Prairie Friends
Green Earth, Inc.
Hawthorne Hill Nature Center
Horseshoe Bottom Nature Preserve
Illinois Audubon Society
Illinois Department of Natural Resources
Illinois Forestry Association
Illinois-Indiana Sea Grant College Program
Illinois Invasive Plant Council
Illinois Native Plant Society
Lake County Forest Preserve District
The Nature Conservancy
Northeast Illinois Invasive Plant Partnership
Prairie State Conservation Coalition
River to River Cooperative Weed Management Area
Salt Creek Greenway Association
Save the Prairie Society
Shawnee National Forest
Shawnee Resource Conservation and Development Area, Inc.
Sierra Club
Southern Illinois University at Carbondale - Center for Ecology
Southern Illinois University at Carbondale - Plant Biology
The Morton Arboretum
USDA - APHIS Veterinary Services
USDA - Natural Resources Conservation Services
Village of Itaska
Village of Schaumberg