^ Sutter, R. D. 1986. Monitoring rare plant species and natural areas - ensuring the protection 

 " of our investment. Natural Areas Journal 6: 3-5. 



USDI-Fish and Wildlife Service. 1990. Endangered and threatened wildlife and plants: 

 Review of plant taxa for listing as endangered or threatened species; Notice of review. 

 Federal Register 55: 6184-6229. 



Wilson, E. O. 1988. Biodiversity. National Academy Press, Washington D.C. 



