ORCHIDACEiE 



H. dilatata "O. acuta. Herb. Banks, mss. 



"In Labrador. Colmaster %. v. s. in Herb. Dickson.'" Pursh, 

 loc. cit. 



H. dilatata var. media {Rydb.) Ames, in Rho. 10 : 70 (1908), 

 in Gray's Man. ed. 7, 308 (1908). 



Limnorchis media Rydb., in Britton's Man. 294 (1901) in 

 part, in Bull. Torr. Bot. CI. 28: 618 (1901) in part, according 

 to specimens in Columbia Herbarium; Andrews, in Rho. 4: 80 

 (1902); Haberer, in Rho. 7: 106 (1905); House/m Bull. Torr. 

 Bot. CI. 32:377 (1905). 



This variety is distinguished from the species by its greenish- 

 yellow flowers. From H. hyperborea, with which it is likely to 

 be confused, it is distinguished by the rhombic base of the la- 

 bellum. It is found together with the species. No attempt has 

 been made to distinguish between the white and greenish flow- 

 ered forms in the following citations of specimens. 



Habenaria dilatata is an extremely variable species both in 

 its vegetative and floral parts, consequently agreement as to 

 what forms it should include is hardly to be expected. In my 

 studies I have examined material both dry and fresh, both wild 

 and cultivated, and I have found no satisfactory characters by 

 which to separate from one another and from H. dilatata the 

 segregates which have been recognized by botanists. The origi- 

 nal or type specimen oi H. dilatata preserved in the British Mu- 

 seum of Natural History, although badly damaged, is quite ser- 

 viceable and exhibits a boreal state which differs from the lux- 

 uriant specimens common in more southern localities in nothing 

 but its vegetative parts. The habit of the type is well repre- 

 sented by specimens collected in the Province of Quebec in al- 

 pine bogs on ;Mt. Albert by Collins and Fernald. Such forms 



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