POTKNTILLA. ROSACE^. 'J4l 



Lnhrad. p. 75. P. aurea, Fl. Dan. t. 114. P. crocca, Hallrr, f. in 

 Schlekh. cat. (1807) ; Lchm. ! Pot. p.\U. 



Greenland, Homemaym ! (v. sp. in herh. Lchm.) 



*■ 16. P. argcntea (Linn.): stems asccndinc;, cory'mbosc at the siimmii, 

 tomenlose; leaves palniately 5-foliolatc ; leaflets oblonif-cuneit()rni, hicini- 

 ately pinnalifid or incised, entire towards tlie base, tlic niarain revoluic, 

 glabrous above, eanescent beneath; flowers crowded; ])etais obovate, retuse, 

 longer tlian the obtusisii calyx-segments. — Linn..' spec. 1. ^;. 497 ; Enf>l, 

 hot. t. 289 ; Pursh, fl. 1. p. 355 ; ^Torr..' fl. 1. p. 497. 



Barren fields and rocky places, Canada ! and Northern Slates ! June- 

 Sept. — Stems numerous, 4-10 inches long, rather woody at the base. 

 Flowers small. 



17. P. minima (Haller, f.) : stems ascending, pubescent, mostly 1-flowered; 

 leaves Irifoliolate ; leaflets obovate, very obtuse, glabrous, but liairy on the 

 margin and the veins of the lower surface, the hairs erect-si)readiMg, incisely 

 serrate towards the apex, with about 4 teeth on each side and a nearly e(iual 

 terminal one (petals obcordatc, longer than the calj^x ; exterior calyx-seg- 

 ments oval, obtuse, narrowed at the base. Lchm.) Koch. — Haller, f. in 

 Schleich. ])l. exsic. 1. no. 59 ; Serinffc, mus. Helv. 1. ]J. 51, t. 8, S^in DC. 

 I. c. : Koch, fl. Germ. S^ Helv. p. 218. P. Brauniana, Hoppe, tausch. ; 

 Lchm. ! Pol. p. 179, not of Nestl. ex Scringe. 



0. flowering stems very short, but somewhat elongated in fruit. — P. Rob- 

 binsiana, Oakes ! niss. 



Al])ine region of the White Mountains, New Hampshire, Nuttall ! Mr. 

 Oakes! Mr. Tuckerman! (P.) June-July. — Root fusifomi. Leaves and 

 stems crowded, 1-3 inches high. Flowers small. — Our plant agrees well 

 Nvith the character of P. minima (taken chiefly from Koch), and with Euro- 

 pean specimens. 



18. P. nana (Lehm.) : stem erect, 1-flowercd ; leaves trifoliolate ; leaf- 

 lets roundish-obovate, obtusely toothed, hairy on both sides or ratlicr canes- 

 cent beneath ; petals obcordate, thrice the length of the calyx ; exterior 

 calyx-segments roundish, very obtuse. Lehm.! Pot. p. 181, t. 17, <^ in 

 Hook. I. c. ; DC. j^rodr. 2. p. 573. 



Labrador, Kohlmeister ! On the highest Rocky Mountains, Drummond ! 

 Kotzebue's Sound ! &c.— Flowers large. Petioles elongated. This is per- 

 haps the P. emarginata, Pursh, which is the oldest name. 



~f- 19. P. nivea (Linn.) : villous or tomentose ; stems ascending, few-flowered ; 

 leaves (mostly radical) palmately 3- (rarely 5- ) foliolate ; leaflets oval or 

 obovate-cuneiform, pinnatifid-toothed or incised, silky-hirsute or nearly gla- 

 brous above, canescent-tomentose beneath; stipules lanceolate, entire; petals 

 broadly obcordate, longer than the acute calyx-segments. — Vahl. fl. Dan. I. 

 1035 ,• Pursh! fl. 1. p. 353; '' Rottb. in act. Hafn. 10. ^^. 451, t.7, ex R. 

 Br. ! in Parnfs 1st voy. appx. p. 211 ; DC. ! prodr. 2. p. 572 ; Richards. ! 

 appx. Frankl. journ. eel. 2. p. 20 ; Hook. ! I. c. 



p. " leaves sparsely villous and of the same color on both surfaces" [seg- 

 ments of the calyx all very obtuse !] R. Br. I. c. ; Hook. ! in Parry's 2nd 

 voy. appx. p. 395. P. frigida ? Grev. in mem. Wern. soc. 4. p. 430, ex R. Br. 

 P. Grcenlandica, R. Br. in Ross's voy. (ed. 2.) 2. p. 193. P. verna. Hook, 

 in Scoresb. Greeril. p. i31. 



y. stems 1-2-flowered ; flowers large ; petals very broadly obcordate.— 

 P. hirsuta, Vahl ! fl. Dan. t. 1390 ; DC. I. c. P. Vahliana, Lchm. ! Pot. 

 p. 172, Sf-in Hook. I. c. P. Jamesoniana, Grcv. I. c. t. 20, fide Hook. 



Greenland ! and Labrador ! Shores and Islands of the Arctic Sea ! to 

 Behring's Straits! and along the Rocky Mountains to lal. 52°, and to 



56 



