Quebec and Newfoundland south to South Carolina, 
Georgia, Alabama, Mississippi and Louisiana; southwest 
to New Mexico and west to the Yukon, British Colum¬ 
bia and Washington. Its flowering season is from April 
(in the South) to August (in the extreme North). 
It is very probable that further study relating to our 
North American Cypripediums will result in the reduc¬ 
tion of C. montanum Dougl. as merely a white form of 
C. Calceolus. J.D.Hooker (Bot. Mag. 119 (1893) t.7319) 
points out that “ Cypripedium montanum is the repre¬ 
sentative in Western America of the common C.pubes- 
cens of the Eastern States; and is so closely allied to the 
latter plant that except in its lip being white (not yel¬ 
low) and its flowers fragrant, there is little to distinguish 
them.” Franchet (Journ. de Bot. 8 (1894) 229) said that 
C.parviflorum and C. montanum approached C. Calceolus 
very closely, and Rolfe (Orch. Rev. 25 (1917) 125) said 
that the general resemblance of C. montanum to C. Cal¬ 
ceolus was “most marked”. 
I wish to express my gratitude to Professor Oakes 
Ames, Mr. Charles Schweinfurth and Mr. F. Tracy 
Hubbard for their helpful suggestions and criticisms dur¬ 
ing the preparation of this paper. 
[18] 
