64 



PITTONn. 



knows ; and it is time that tho life liistory of so fine a planfc 



sLoulcl be looked into by some one who has it within hi& 

 veach. 



TJie species has not been credited to California, nor was 

 anything like it found at all near the borders of the State, 



^ew York ancl New 

 England type, the specimens just matching those from Lake 

 Ciiamplain, came in from Humboldt County, where they had 

 been collected by Messrs. Chesnut and Drew, of the Uni- 

 versity of California. The 



near the shores of the Pacific becomes the more remaVkable 

 wlien we consider that it is otherwise unknown to the west- 

 ward of Wisconsin and Minnesota ; all the formerly so-called 



occur 



ifidus 



R. 



to 



R. NATAXS, C. A. Meyer, in Ledeb. Fl. Altaica, ii. 315 (1830), 

 Fl. Eoss. i. 34 (1812) ; Gray, Proc. Am. Acad. xxi. 366 (1886) : 

 R. Purshii partly of many authors: R. hypcrloreus, var. 

 naians, Porter, Fl. Colo. 3. 



This is a variously creeping or floating, but not submersed 

 plant, of wide range from the middle altitudes of the Colorado 

 mountains far northward. It was of course long mixed up with 

 tlie so-called R. multijidus, from which its achenes small and 

 numerous, with a very short cylindrical style should always 

 have made it readily distinguishable. The restoration of it 

 to its proper specific rank was made late by Dr. Gray. 



J 



R LIMOS0S, Nutt. in T. & G. Fl. i. 20 (1838) ; Walp. Eep.i. 

 42 : R. muUiJidus, var. limosus, Lawson, llev. Ran. Canad. 



47 (1884). 



This, which appears to have been at last referred by 

 Dr. Gray to the preceding, is clearly distinct, as I had 

 good opportunity of learning while on its native soil last 

 summer. It is seldom creeping in habit, usually assurgeid, 

 only the lower joints rooting. The leaves are orbicular, 

 quite large, cleft into broad divisions and subdivisions, and 



