2gQ ROSACE.E. Poteniilla. 



9. P. gelida, C. A. Meyer. Nearly glabrous, the pubescence minute or villous : 

 stems low, slender, 1 - 3-llowered : leallets very broadly cuneilbnn, 6 to 9 lines long, 

 rounded at the apex and coarsely 7 - 9-toothed ; terminal lealiet shortly petiohdate : 

 bractlets and calyx-lobes nearly equal, obtuse or acute : petals 2 or 3 lines long, a 

 little exceeding the calyx : cari)eld numerous. —Watson, 1. c. 559. F. jhiidUjoUa, 

 Hook. ; Torr. i>c Gray,'!! i. 442 ; Lehm. lievis. 153, t. 51. 



In the Sienn Nevada at Siiminit (^Bolander) and on Lassen's Peak (/. O. Lemvxmi), and north- 

 ward to Washington Territory ; also in Northern Asia. 



* * * Style fiitform, attached at or heiuw the middle of the ovary : leaves pinnate : 



jloiucrs yellow : recejAacle small, villous. 



+- J/crlntcious, slu/iJiiif,roiis and cr<rj>ini/ : akenes (/lalirous : Jlowers axillary, solitary. 



10. P. Anserina, Linn. White-tomentosu and silky-villous : leaves all radical, 

 often a tout long or mnre ; leallets 3 to 10 jiairs, with smaller ones interposed, 

 oblong, sharply serrate, tomentose at least beneath ; stipules many-cleft : bractlets 

 often Incised, about equaUing the caly.x-lobes : petals 3 to G lines long, exceeding 

 the calyx : stamens 20, rarely 25 : carpels 20 to 40 ; the style attached to the mid- 

 dle : receptacle very villous. 



On stream banks ; freciuent throughout North Aniorica, as also in Soutli America and the OKI 

 World. Very variable in aho and amount ol' pubescence. 



+- +■ Shrubby : akenes villous : Jlowers terminal, cymose or siditary. 



11. P. fruticosa, T.inn. Much branched, 1 to 4 feet high, silky-villous: stip- 

 ules scarious; leallets 5 to 7, obh)ng-lanceulat(!, entire, approximate, 2 to 12 lines 

 long, lighter colored beneath and the margin revolute : petals 2 to C lines long, ex- 

 ceeding the calyx : stamens 30 : carpels 20, very villous, the style attached below 

 the middle. 



In the Sierra Nevada from Ebbett's Tass northward, and througliout the northern portion of 

 North America. Also freipient in the Old World. 



* * * * Styles Jlli/orni, attached to (he middle of the numerous i/lahrous car/jeU, 

 xohich are sessile upon a lari/e spomjy rece/dacle ; herbaceous perennial, with lan/e 

 purple jUiwers and pinnate leaves. 



12. P. palustris, Scop. Stems stout, ascending from a decumbent rooting 

 perennial base ; nearly glabrous : leaflets 5 to 7, oblong, an inch or two long, ser- 

 rate : flowers few, in an open cyme: calyx purplish, 6 to 10 lines long in fruit; 

 bractlets linear, much shorter : i)etals spatulate, acute, 2 or 3 lines long : stamens 

 20, upon the margin of the thickened disk. — Comarum palustre, Linn. 



Collected only in Sierra County, by J. G. Lcmvion. More frequent northward from I'uget 

 Sound to Alaska, and eastward across the continent. 



15. SIBBALDIA, Linn. 



Petals linear oblong, minute. Stamens 5, alternate with the petals ; fdaments 

 very short. Carpels 5 to 10 : styles lateral : ovule ascending. Otherwise as Poten- 

 tilla. — Dwarf and cesj)itose arctic or alpine perennials ; leaves thick, trifoliulate, the 

 leaflets few-toothed at the truncate summit ; flowers cyinose, yellow. 



Of the 4 or 5 Asiatic species the following is also European and American. 



1. S. procumbens, Linn. S(miewhat villous : stems creeping, leafy at the 

 extremities: leallets cuneate, 3-5-toothed, 3 to 12 lines long: peduncles usually 

 shorter than the leaves: calyx-lobes 1 to U lines long; bractlets linear and shorter: 

 petals much shorter, acute ; akenes on very short hairy stipes. 



In the Sierra Nevada from Mt. Dana, at 12,500 feet altitude {BoJand.r), to Lassen's Peak 

 (Lemmmi) and Mt. Siiasta, at 8,400 feet, Brcwn: Also in the Rocky Mountains of Colorado, 

 and the Wliile ilountains, and northward to Alaska and Greenland. 



