'blossom Hosts and Insect Gnests 



crimson, and pink. The mechanism of their cross- 

 fertilization is the same in all, with only slight modi- 

 fications. 



Our initial illustration shows the whtie species, 

 but the most common of the group, the C. acanlc, 



widely known as 

 the moccasin-flower, 



Profile View , , , 



of Column. whosc large, nod- 



ding, pale crimson 

 dniher blooms we SO irre- 

 sistibly associate 

 with the cool hem- 

 lock woods, will af- 

 ford a better il- 

 lustration of the 

 general method of 



dotfed line ind 

 icafing sfigmca 



fertilization em- 



sl-fgma. 

 tcclumn 

 beneafh) 



Under View of Column, ploycd by the tribe. 



Fig. I. 



The lip in all the 

 cypripediums is more or less sac-like and inflated. 

 In the present species, C. acatclc, however, we see 

 a unique variation, this portion of the flower 

 being conspicuously bag-like, and cleft by a fissure 

 down its entire anterior face. In Fig. i is shown a 

 front view of the blossom, showing this fissure. 

 The ''column" (B) in the cypripedium is very 



158 



