- Abu Dhabi Environment Agency
- Alaska Department of Natural Resources
- California Department of Fish and Game
- California Native Plant Society
- City of Alhambra, California
- City of Glendale, California
- City of Hillsboro, Oregon
- City and County of Honolulu
- City of Lake Elsinore, California
- City of Los Angeles
- City of Phoenix, Arizona
- City of Rancho Mirage, California
- City of West Hollywood, California
- Clark County, Nevada
- Coachella Valley Association of Governments
- East Valley Water District
- ESRI
- Irvine Ranch Corporation
- Instituto de Investigaciones de Arquitectura y Sistemas Ambientales (ISA), Zulia University, Venezuela
- Keyspan Electric, New York
- Las Virgenes Water District
- Los Angeles County, California
- Marin Municipal Water District
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- Marin County Open Space District
- Marion County, Ohio
- Merced County, California
- Metropolitan Water District of Southern California
- Midpenisula Open Space District
- Ministry of Agriculture, Jamaica
- New Jersey Department of Environmental Protection
- Peninsula Open Space Trust
- Pioneer Resources LLC, Eastern Oregon
- Placer County, California
- Resource Conservation District of the Santa Monica Mountains
- San Bernardino County, California
- San Luis Obispo County, California
- Southern California Association of Governments
- Southern California Edison
- State of North Carolina
- The Nature Conservancy
- UNESCO
- US Fish and Wildlife Service
- US Bureau of Reclamation
- US Bureau of Land Management
- US Geological Survey
- University of California, Davis, Information Center for the Environment
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- US National Park Service
- Agate Fossil Bends National Monument
- Assateague Island National Seashore
- Congaree National Park
- Fort Laramie National Monument
- Golden Gate National Recreation Area
- Great Smoky Mountains National Park
- Isle Royale National Park
- Joshua Tree National Park
- Pinnacles National Monument
- Point Reyes National Seashore
- Rock Creek National Park
- Santa Monica Mountains National Recreation Area
- Scotts Bluff National Monument
- Sequoia/Kings Canyon National Park
- Tuzigoot National Monument
- Yosemite National Park
- University of California, Berkeley, Jepson Herbarium
- Washoe County, Nevada
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