ROSACEA, (rose family.) 85 



10. p. PlattensiS, Nutt. Subalpiue: pubescence appressed sUhj-villom 

 thruwjiiout, scant ji or nearlij wantiny : stems decumhenf : leujiets 7 to 13, usual! ij 

 crowded and often alternate, deeplij incised-pinnatijid into 3 to 7 linear segments: 

 flowers few, in an open cyme: carpels 2.5 to 40. — Torr. & Gray, Fl i. 439. 

 P. diversifoUa, var. pinnatisecta of Bot. King's Exp. 87. Mountains of Colo- 

 rado and Nevada, and in tlie Uintas. 



11. P. disseeta, Fursli. Low, alpine, more or less sill'i/-ri!lous, with some- 

 what spreading hairs, or nearly glabrous: stems decumbent or ascending: lea/lets 

 5 to 7, or rarely but 3, often glaucous, closehj pinnate, or as frequently digitate, 

 the upper one inciselg pinnatifid or serrate, the lowest ojlen but trifid: flo\\-ers few, 

 in an open cyme: carpels 10 to 20 or more. — P. diversifoUa, Lehni. From 

 Colorado to California and British America. The following varieties occur 

 with the type. 



Var. glaucophylla, Lehm. Glaucous-green: leaves digitate, nearlg gla- 

 brous on both sides. 



Var. multisecta, AVatson. Canescent tvith a not very dense silkg pubes- 

 cence : leaves digitate or nearly so, the leaflets digitatelij or pinnatelg divided 

 and the segments linear. — Bot. King's Exp. 86. 



Var. (?) decurrens, Watson. Leaflets but 3 or with 1 to 2 additional 

 distant pairs of smaller ones, the terminal leaflet truncatelg 3-toothed, the upper 

 pair 2 to 3-toothed, conspicuoushj decurrent: stem \-floicered, 3 inches high, gla- 

 brous throughout, excepting the villous calyx and tufted apices of the leaves. — 

 Rev. Pot. 557. From peaks of the Uintas. 



■w. ++ Leaves dig itatelg 5 to 7-foliolate (rarely pinnate in No. 12): tomentose or 



villous. 



12. P. gracilis, Dougl. Villous and more or less tomentose: stems 2 to ^ 

 feet high: leaflets mostly 7, incisely serrate or pinnatifid, tomentose beneath, 

 green above and subvillous or appressed silky: carpels 40 or more. — From 

 New Mexico to Utah and California, and thence northward to the Saskatche- 

 wan and Alaska. 



Var. fiabelliformis, Torr. & Gray. Leaflets very deeply pinnatifid. — 

 Fl. i. 440. 



Var. fastigiata, Watson. Cyme shorter and more compact, more densely 

 pubescent : often low. — Rev. Pot. 557. P. fastigiata, Nutt. 



Var. rigida, Watson. Villous, but without tomentum : usually tall and stout. 



— Loc. cit. P. Xuttallii, Lehm. 



13. P. humifusa, Nutt. Densely ichite-tomentose and silky-rillons: stems 

 decumbent, 2 to 4 inches long, slender : leaflets 5, green and appressed silky 

 above, only the rounded or truncate apex serrate irith 3 to 5 teeth : carpels 15 to 20. 



— From the mountains of Colorado to the Saskatchewan. 



4-1. ++ ++ Leaves ternate: low, arctic or alpine, few-flowered. 



14. P. nivea, L Pubescence silky-villous, densely white-tomentose on 

 the under side of the leaves : leaflets coarsely incised-serrate or pinnatifid, the 

 terminal one sessile or petiolulate : carpels few or many. — From Colorado 

 northward. 



Var. disseeta, Watson. Leaves digitately or piunntoly o-foliolate, the 

 leaflets deeply pinnatifid : stems 1 to 2 inches high, 1 to 3-ric)wercd. — Rev 

 Pot. 559. In the Uintas and mountains of Montana and British America. 



