608 Rydberg; The American Species of 



In Hahenaria hyperborea R. Br. or Platanthera hyperborea 

 Lindl. there have been included several other forms, as for instance 

 Orchis Huronensis Nutt.* {Platantkera Huronensis Lindl. /. c. 288), 



O. dolichorhiza Fisch.t and Habcuaria borealis fi viridiflora Cham.t 

 All three, I think, are good species and they were so regarded by 

 Lindley. The first is common in the northeastern America. In 

 Britton's manual it appeared under the name Liuuiorchis Huronensis 

 (Nutt.) Rydberg. § I also described another species of the same 

 group as L. media. That there were at least three distinct forms 

 of the L. hyperborea group in the northeastern United States, I have 

 not been the only one to notice, for Professor Peck || recognized 

 three growing in the same meadow. I did not see his report be- 

 fore the page proofs of the manual had already gone to the printer, 

 but had come to the same conclusion independently. As the L. 

 liypcrborea of my treatment there contains in my opinion now two 

 species, as I have stated before, the number of the group in the 



northeastern United States becomes four, and, together with three 

 species of the L. dilatata group, our eastern species become seven. 



Habcuaria boreal ts ,3 viridiflora Cham, is common throughout 

 the Rocky Mountain region, the Columbia valley and the northern 

 part of the Pacific coast. It is without doubt closer related to the 

 true L. Jiypoborca than any of the other species and differs mainly 

 in the light green flowers and the short clavate spur. 



Orchis dolichorhiza {Platanthcra Kocnigii ,9 dolichorhiza Lindl. 

 /. c. 287), I have not seen, but from the description it must be 

 distinct from either. This was from the island of Unalaska. 



The second in order of the North American species of Limner- 

 chis described was published under the name Orchis dilatata Purshf 

 {Limuorchis dilatata Rydb.**). It is a common plant of the north- 

 eastern part of this country. Most of the specimens so named from 

 the Rockiesand thewest coast belong 1 Xjo Habcuaria borca/isCh^mA\ 



*Gen. N. Am. PI. 2 : 189. 1818. 



fLind. 1. c. 287, as a synonym. 



J Linnaea 3 : 28. 1828. 



\ Britt. Man. Fl. Northern States and Can. 294. 1901. 



|| See Peck, Regent's Rep. 50 : 126. 1897. 



\ FL Am. Sept. 588. 1814. 



**Britton, Man. Fl. N. St. 294. 1901. 

 tf Linnaea 3: 28, 182S. 



