REFERENCES 



Ahles, H. E. A Flora of New England. University of Massachusetts Herbarium, 

 Amherst, Mass. In preparation . 



Ayensu, E. S., and R. A. DeFilipps. 1978. Endangered and Threatened Plants 

 of the United States. Smithsonian Institution and the World Wildlife 

 Fund, Inc. Washington, DC. 



Brower, A. E. 1977. Ram's-Head Lady' s-Slipper , Cypripedium arietinum R. Br. 

 in Maine and Its Relevance to the Critical Areas Program. Report No. 25 

 prepared for the Maine Critical Areas Program, Maine State Planning 

 Office, Augusta, ME. 



Burk, J. D. 1977. A four-year analysis of vegetation following an oil spill 

 in a freshwater marsh. J. Appl. Ecol. 14:515-522. 



Cameron, C. 1975. Some peat deposits in southeastern Aroostook and 

 Washington Counties, Maine. U.S.G.S. Bull. 1317-C. 



Crovello, T. J. 1978. The mustard data bank. Computer printout of all label 

 data on 54 specimens of Cardamine longii borrowed by Crovello from 75 

 museums and herbaria. Available from T. J. Crovello, Department of 

 Biology, University of Notre Dame, Notre Dame, Indiana. 



Damman, A. W. H. 1979. Geographic patterns in peatland development in 

 eastern North Amerian. Proc. Intern. Sym. on Class, of Peat and 

 Peatlands. Hyytiala, Finland. Intern. Peat Soc. Pp. 42-57. 



. 1977. Geographic changes in the vegetation pattern of raised bogs in 



the Bay of Fundy Region of Maine and New Brunswick. Vegetatio 35:137- 

 151. 



Darwin, C. R. 1877. The Fertilization of Orchids by Insects. 2nd ed. D. 

 Appleton, NY. 



Davis, R. B. 1966. Spruce-fir forests of the coast of Maine. Ecol. Mono. 

 36:79-94. 



Eastman, L. M. 1976a. Ginseng ( Panax quinquefolius L.) in Maine and Its 

 Relevance to the Critical Areas Program. Report No. 16 prepared for the 

 Maine Critical Areas Program, Maine State Planning Office, Augusta, ME. 

 19 pp. 



. 1976c. Long's Bitter Cress ( Cardamine longii Fern.) in Maine and Its 



Relevance to the Critical Areas Program. Report No. 17 prepared for the 

 Maine Critical Areas Program, Maine State Planning Office, Augusta, ME. 



. 1977. Auricled Twayblade (Listera auriculata W.) in Maine and Its 



Relevance to the Critical Areas Program, Maine State Planning Office, 

 Augusta, ME. 15 pp. 



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