86 MEMOIRS FEOM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



as far south as Colorado. It is very variable. The varieties reported for North Amer- 



ica are : 



Potentilla nivea macrophylla Ser. 



Pntcnfilla nivea Lodd. Bot. Cab. 5, j^/. 460. Not L. 



Rottboell, Kjoeb. Selsk. Laer. & Vid. 10 : 450 ; R Br. App. Parry's Voy. Supp. 277. 



Potentilla nivea macrophylla Ser. in DC. Prod. 2 : 571. 1825. 



Hook. Bot. :\Iag. 57 : pi 2982; Lehm. Stirp. Pug. 9 : 68 ; Del. Sem. Hort. Hamb. 

 1850: 12; Rev. Pot. 168; Don, Card. Diet. 2: 550; Dietr. Syn. PL 3: 178; Walp. 

 Am. 2 : 508 ; Rydb. Bull. Torr. Bot. Club, 23 : 302. 



Illustrations: Rottboell, Kjoeb. Selsk. Laer. <fe Vid. 10: j>/. 7*; Hook. Bot. Mag. 

 58 : j)l. 2fiS2; Lodd. Bot. Cab. 5 : pi 460. 



Leaves larger, 3-6 cm. long, coarsely serrate or incised ; plants generally taller. 



Arctic and sub-arctic regions. Specimen seen : 



Manitohd : John Macnun, 1881. 



Potentilla nivea pallidior Swartz. 

 Potentilla nivea pallidior Swartz, Samma Veg. Scand. 19. 1814. 

 Lehm. Mon. 184 ; Wahlenb. Fl. Saec. 326. 

 Potentilla nivea subviridis Ledeb. Fl. Eoss. 2 : 57. 1844. 



Lehm. Stirp. Pug. 9 : 68 ; Lange, Consp. Fl. Goenl. 9; Eosenvinge, ibid. 656. 

 Leaves only sparingly tomentose beneath. 

 This approaches P. nana in habit, and grows in arctic Norway and Greenland. 



Potentilla nivea Altiaca (Bunge). 



Potentilla nivea pinnatifida Lehm. Stirp. Pug. 9: 68; Rev. Pot. 168, 1856. Del. Sem 

 Hort. Hamb. 1850 : 12 ; Lange, Consp. Fl. Groenl. 236; Rosenvinge, ihici. 656. 



Potentilla Altiaca Bunge, in Ledeb. Fl. Alt. 252; Ledeb. Fl. Ross. 2: 58- Icon Fl 

 Ross. 111. 4 : pi 329*- ' 



Potentilla nivea clisseda Watson, Proc. Am. Acad. 8 • 559 1873 

 Macoun Cat. Can. PL 139 and 518, 1883; Coulter, Man. Bot. Rocky Mts. 85- 

 Rydb. Cont. U. S. Nat. Herb. 3 : 497. In part. 



_ Potentilla nivea subqnincUa Lange, Consp. Fl. Groenl. 9 and 235, 1880-7 • Rosen- 

 vinge, ibal 656. ' 



Illusteatioxs ; Ledeb. Icon. PL Fl. Ross. 4 : pi S'.g 



Leaves ternate as well as quinate; leaflets rather small, deeply pinnately dissected. 



