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3. Triphora trianthophoros (Swartz) Rydberg in N. L. Britton, Man. Fl. N. States.  298.  1901 (as trianthophora).  
Nodding pogonia  
 
 
 
 
Arethusa trianthophoros Swartz, Kongl. Vetensk. Acad. Nya Handl. 21: 230.  1800 
 
Subspecies 2 (1 in the flora): e North America, Mexico, Central America. 
 
 
 
 
 
SELECTED REFERENCE   Medley, M. E.  1979.  Some Aspects of the Life History of Triphora trianthophora (Sw.) Rydb. (Three Birds Orchid) with Special Reference to Its Pollination.  M.A. thesis.  Andrews University. 
 
 
                         
                             
	 
                      
                         
		
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