16 GEOLOGICAL SURVEY OP CANADA. 



(28). R. aquatiliS, Linn. var. trichop hyllus, Chaix. White 

 Water-crowfoot. 



R. fluviatilis, Pursh, 395. 



R. aquatilis var. capillaccus, DC. Hook. Fl. I., 10. 



R. aquatilis var. brachypus, Hook. & Arn. Torr & Gray, Fl. I., 658. 



Common in stagnant pools and slow-flowing brooks, from Capo 

 Breton (Bow.') to British Columbia. (Macoun.) Coppermine River. 

 (Simpson ) Greenland. (Hook. Arct. PL} 



Var. stagnatilis, DC. 



R. divaricatus, Gray, Manual, 40. 



In stagnant pools from Eat Creek, Manitoba, westward to the moun- 

 tains. (Macoun.) 



Var. caespitosus, DC. 



Borders of forest lakes. Small lakes, North Hastings, Ont. 

 (Macoun.), thence northward and westward. (Hooker.) 



The first is the common eastern form, and often grows in company 

 with the latter, while the second is the characteristic form of the stag- 

 nant pools of the prairies. 



(29.) R. multifldus, Pursh. Yellow Water-crowfoot. 

 R. Purshii, Torr. Hook. Fl. L, 16. 



Common in stagnant pools and ditches. Cape Breton Island to the 

 Pacific and northward to near the Arctic Sea. Kotzebue Sound. (Rothr. 

 Alask.) 



Var. P. Watson's Index, 20. 



R. Purshii var. y. Hook. Fl. I., 15. 



R. limosus, Nutt. in Torr & Gray, Fl. L, 20. 



In or on the margins of small pools on the great prairies; in the 

 Touchwood Hills, N. W. T. (Macoun.) Lakes and marshes about 

 Cumberland House and Slave Lake. (Richardson.) Kocky Mountains. 

 (Drummond.) In pools near Stuart's Lake, B.C. (Macoun.) 



Var. y. repens, Wateon in King's Eep., 8. 

 R. Purshii, var. /3. Richardson. 



In a muddy brook near Flinton, Hastings Co., Ont. Numerous 

 places on the great prairies. (Macoun.) Swamps, foot-hills of Kocky 

 Mountains. (Dawson.) Bear Lake. (Richardson.) 



(30.) R. aiismsefolius, Geyer. Water-plantain. Spearwort. 

 Macoun's Cat., No. 23. 



In inundated places on mud. Southern part of Ontario. (Groldie.) 



