1. Native Plant Conservation Campaign, San Francisco, CA 94107, USA.
2. NatureServe, Arlington, VA 22202, USA.
3. Smithsonian-Mason School of Conservation, Front Royal, VA 22630, USA.
4. North American Plant Red List Authority, Arlington, VA 22202, USA.
5. Plant Conservation Alliance Nonfederal Cooperators Committee.
6. Chicago Botanic Garden, Glencoe, IL 60022, USA.
7. Center for Plant Conservation and San Diego Zoo Global Institute for Conservation Research, Escondido, CA 92027, USA.
8. Botanic Gardens Conservation International, U.S. at The Huntington Library, Art Museum, and Botanical Gardens, San Marino, CA 91108 USA.
9. The Garden Club of America, New York, NY 10022, USA.
10. North Shore Land Alliance, Oyster Bay, NY 11771 USA.