50 Jlrethusa biMosa. 



Grows in sphagnous morasses, from the northernmost to the most 

 southern section of the Union.— Not common. Flowering time June. 



This simple little plant is the only North American species which 

 can he legitimately retained in the genus Arethusa, as modified by R. 

 Brown. Its habit is altogether singular, and the plant cannot readily he 

 confounded with any other of the Orchidean trihe. 



The table, fig. 1. represents the plant in flower, of its natural size, 



