16 GEOLOGICAL SURVEY OF CANADA. 



(28). R. aquatilis, Linn. var. trichophyllus, Chaix. White 

 Water-crowfoot. 



R. fluviatUis, Pursh, 395. 



R. aquatUis var. capillacetm, DC. Hook. Fl. I., 10. 



R. aquatilis var. brachypug, Hook. & Am. Terr & Gray, Fl. I., 658. 



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

 Breton (How.) to Britisli Columbia. (Macoun.) Coppermine River. 

 (Simpson ) Greenland. (Hooh. Arct. PI.) 



Var. stagnatilis, DC. 



R. diraricatm, Gray, Manual, 40. 

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

 tains. (Macoun.) 



Var. csespitosus, DC. 



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

 (Macoun.'), thence northward and westward. (Hooher.) 



The first is the common eastern foi'm, 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. multifidus, Pursh. Yellow Water-crowfoot. 



R. PursMi, Torr. Hook. Fl. I., 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. /3. Watson's Index, 20. 



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



R. limosus. Nutt. in Torr & Gray, Fl. I., 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.) Eocky Mountains. 

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



Var. 7. repens, Watson in King's Eep., 8. 

 R. Purshii, var. fi. Richardson. 



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

 places on the great prairies. (Macoun.) Swamps, foothills of Eocky 

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



■•(30.) R. alismaefolius, Geyer. Water-plantain. Spearwort. 

 Macoun's Cat., No. 23. 



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



