560 PROCEEDINGS OF THE AMERICAN ACADEMY 



Pass (Newberry) ; Cascade Mts. (Lyall). Our plant seems to accord 

 perfectly with the Asiatic species. 



23. P. Grayi. Pubescence scanty, villous ; stems slender, 3 - C 

 high, 3 - 6-flowered ; stipules ovate or oblong, entire ; leaflets very 

 broad and suborbicular, y long, the truncate or rounded apex 5-7- 

 toothed, the middle leaflet long-petiolulate ; sepals acute, the bractlets 

 but half as long and obtusish ; petals 2 - 3" long, orbicular, retuse, ex- 

 ceeding the calyx; carpels 15-20. — Yosemite Valley (Bolander ; 

 Gray) ; Lake Tenayo (Brewer) ; Gray's Peak, Colorado (Gray). 



24. P. frigida, Vill. Very reduced, but \- 2' high, villous ; leaflets 

 broadly cuneate-obovate, 3 - 5-toothed at the summit, 2 - 4" long, nearly 

 glabrous above ; flowers solitary, small, on very slender stems ; bract- 

 lets and sepals equal, obtuse ; petals obcordate, \y long, a little exceed- 

 ing the calyx ; carpels numerous, but achenia few. — White Mts., New 

 Hampshire. Differing from the European plant only in its rather 

 smaller flowers. 



25. P. brevifolia, Nutt. Minutely glandular-puberulent, the 

 calyx very sparingly villous : stems decumbent or ascending, 2-3' 

 high; stipules ovate, entire ; leaflets suborbicular, 2-3" long, .2 - 3- 

 lobed and crenately toothed, the middle one petiolulate ; bractlets acute, 

 shorter than the acute sepals; petals " obovate," scarcely exceeding the 

 calyx ; style attached below the apex of the ovary. — Collected only 

 by Nuttall ; " Summit of Rocky Mts. (Oregon), near line of perpetual 

 snow, near lat. 42°." 



* ■* Style terminal or medial ; carpels glabrous ; disk thickened or 

 glandular ; stamens 20 ; herbaceous perennials, smooth or nearly 

 so, with large purple or yellow flowers. 



26. P. PALUSTRis, Scop. (Comarum, L.) Stems stout, ascending 

 from a decumbent rooting perennial base, | - 2° long ; glabrous below, 

 minutely silky or glandular-pubescent above ; lower stipules amplexi- 

 caul and long-adnate to the petiole, the upper broadly ovate, entire ; 

 leaves pinnate; leaflets 5 -7,. oblong, 1-2' long, obtuse or acute, 

 lighter-colored, and more or less pubescent beneath ; flowers dark-pur- 

 ple, few, in an open cyme ; calyx large and purplish, the sepals becom- 

 ing 6 — 10" long in fruit, the bractlets linear, acuminate, and much 

 shorter ; petals spatulate, acute, 2 - 3" long ; stamens with stout, fleshy 

 filaments, in one row upon the margin of the thickened disk ; carpels 

 very numerous, sessile upon the large spongy receptacle ; style attached 



