86 MEMOIRS FROM 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. 
Potentilla nivea Lodd. Bot. Cab. 5, pl. 460. Not L. 
2ottboell, Kjoeb. Selsk. Laer. & Vid. 10: 450; R. Br. App. Parry’s Voy. Supp. 27 
Potentilla nivea macrophylla Ser. in DC. Prod. 2: 571. 1825: 
Hook. Bot. Mag. 57: pl. 2982; Lehm. Stirp. Pug. 9: 68; Del. Sem. Hort. Hamb. 
1850: 12; Rev. Pot. 168; Don, Gard. Dict. 2: 550; Dietr. Syn. Pls shies Walp. 
Am. 2: 508; Rydb. Bull. Torr. Bot. Club, 28: 302. 
Intusrrattons: Rottboell, Kjoeb. Selsk. Laer. & Vid. 10: pl. 7*; Hook. Bot. Mag. 
: pl. 2982; Lodd. Bot. Cab. 5: pl. 460. 
Leaves larger, 3-6 cm. long, coarsely serrate or incised ; plants generally taller. 
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Aretic and sub-arctic regions. Specimen seen : 
Manitoba: John Macoun, 1881. 
Potentilla nivea pallidior Swartz. 
Potentilla nivea pallidior Swartz, Summa Veg. Scand. 19. 1814. 
Lehm. Mon. 184 ; Wahlenb. FI. Suec. 326. 
Potentilla nivea subviridis Ledeb. Fl. Ross. 2:57. 1844. 
Lehm. Stirp. Pug. 9: 68; Lange, Consp. Fl. Goenl. 9; Rosenvinge, 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. 2386; Rosenvinge, ibid. 656. 
Potentilla Altiaca Bunge, in Ledeb. Fl. Alt. 252; Ledeb. Fl. Ross. 2: 58; Icon. Fl. 
Ross. Ill. 4: pi. 329". 
Potentilla nivea dissecta 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 subquinata Lange, Consp. Fl. Groenl. 9 and 235, 1880-7; Rosen- 
vinge, ibid. 656. 
Innustrations; Ledeb. Icon. Pl. FI. Ross. 4: pl. 329. 
Leayes ternate as well as quinate; leaflets rather small, deeply pinnately dissected. 
