Fox: SPECIES OF CYPRIPEDIUM. 433 



although circumstantial evidence for such a theory does not 

 exist. 



Exception is taken to this statement especially in regard to 

 Nebraska. ^ 9 Webber affirms that the appearance of the flora 

 and the other constituents of the region, warrant the conclu- 

 sion that "the eastern border of the treeless region at one time 

 extended farther westward, possibly into and through Nebraska 

 to the Rocky Mountains." 



The first record of a Cypripedium was that of Cypripedium 

 calceolus L. " ^ which was found in a wood called the Helkes in 

 Lancashire near the border of Yorkshire (Parkinson Theatr., 

 218. 1640. ) The same species is figured as Calceolus by Tour- 

 nefort. « ^ 



Since that time such a number of species have been discov- 

 ered, and their characteristics so studied as to permit of their 

 systematic arrangement. Aside from the emendation of the 

 generic name which is not adopted, the following arrangement 

 of the genus is as given by Pfitzer. ^ ^ 



DiANDRAE CYPRIPEDINAE. 



Cypripedium. A. Arietina. 



B. Foliosa. 



C. Diphylla. 



The American forms may be distributed in these series ac- 

 cording to their more salient features, while the most nearly 

 related members are placed together. 



A. Arietina. — C. arietinum R. Br. 



B. Foliosa . — C. reginae Walt. 



C. candidum Muhl. 

 C. irapeanum La Lave. 

 C. californicum DouGL. 

 C. passerinum Rich. 

 U. hirsutum Mill. 

 C. parvijlorum Salisb. 

 C. viontanum DouGL. 



C. Diphylla.— C acaule Ait. 



C. guttatum Sw. 



C. fasciculatum Wats. 



C. pusillum RoLFE. 



The single species of the Atlantic region, not found in Min- 

 nesota is Cypripedium pusillum Rolfe, « ^ reported from Florida. 



(59) Webber. Cat. Fl. Neb. 38. 1890. 



(60) Clarke. W. A. Journ. Bot. Brit, and For. 3.3: 17. 1895. 



(61) Tournf. Instit. Rei Herbariae «: Tab. 249. 1700. 



(63) Pfitzer. Engler and Prantl. Nat. Pflanz. a6:8i. 1889. 

 (63) Clarke, J. A. Contrib. Nat. Herb. 1 : 7245. 1893. 



