OF ARTS AND SCIENCES : MAY 13, 1873. 559 



Var. dissecta. Leaves digitately or pinnately 5-foliolate, the leaf- 

 lets deeply pinnatifid ; dwarf, the stems 1-2' high, 1 - 3-flowered. — 

 In the Rocky Mts. of British America and Montana (3G8 Drummond ; 

 Douglas ; Howard) ; and in the Uintas, Utah (335 Watson, in part), 

 at 12,000 feet altitude. 



19. P. fragiforjiis, Willd. Villous with long silky hairs ; stems 

 ^-1° high ; stipules large, oblong, acuminate ; leaflets cuneate-obovate, 

 6 -15" long, sessile, coarsely incised-serrate ; flowers few or solitary, 

 very large ; bractlets ovate, obtuse, shorter than the ovate acute sepals ; 

 petals obcordate, 3 - 6" long, exceeding the calyx. — Aleutian Islands 

 (Pallas); St. Paul's Island (Harrington). 



Var. villosa, Regel & Tiling. (P. villosa, Pall.) Densely white- 

 tomentose, the upper surface of the leaves darker. — Alaska to Van- 

 couver's Island; Mt. Ranier, Washington Territory (Tolmie). 



20. P. maculata, Pour. (P. Salisburgensis, Hsenke. P. opaca, 

 Pursh, not L.) Sparingly villous with long spreading hairs, the pedi- 

 cels subtomentose ; stems ascending, 3-6' high, loosely few-flowered ; 

 stipules ovate to lanceolate, entire ; leaflets 5, rarely but 3, cuneate- 

 obovate, i - 1 ' long, rounded and incisely serrate at the apex ; bractlets 

 obtuse or obtusish, a little shorter than the acute sepals ; petals 

 cuneate-obcordate, 3 - 4" long, exceeding the calyx. — Labrador ; 

 Greenland. 



21. P. emarginata, Pursh. (P. nana, Lehm. P. nivea, var. 

 concolor, R. Br.) Rather more villous than the last, the pedicels 

 densely tomentose, the leaves rarely tomentose beneath ; stems ascend- 

 ing or erect, 1-3' high ; leaflets obovate, 2 - 6" long, the terminal one 

 shortly petiolulate or sessile, very coarsely incised, the 3-5 segments 

 villous-tufted ; flowers 1-2, mostly solitary. ; bractlets and sepals equal, 

 broad, obtuse ; petals 2 - 3" long, considerably exceeding the calyx ; 

 carpels numerous. — Labrador ; Greenland ; Kotzebue Sound ; Rocky 

 Mountains (Drummond). P. nana is the more reduced form. 



22. P. gelida, C. A. Meyer. (P. flabellifolia, Hook.) Nearly 

 glabrous, with a scanty minute or villous pubescence ; stems slender, 

 6-10' high, 1- 3-flowered; stipules oval or oblong, mostly entire; 

 leaflets very broadly cuneiform, 6 - 9" long, rounded at the apex and 

 incisely 7 - 9-toothed, entire at base, the middle leaflet shortly petiolu- 

 late ; bractlets and sepals nearly equal, obtuse or acute ; petals 2 - 3" 

 long, obcordate, a little exceeding the calyx; carpels numerous. — 

 Washington Territory and Oregon; Mt. Ranier (Douglas); Crater 



