17G 



ROSACl'LK. 



ilowers few, an inch or more in diunieter : calyx-lobes ovato, 3 or 4 lineti \on<^, the 

 apex linear or Iriliil ; bractlets linear, entire or Itilid or ^-parted : akenes very 

 numerous, U lines long, the slender plumose tail an ineh or two long. — Turrey in 

 Emory liep/l-lU, t. 2. iSieversia paradoxa, Don, 1. c. 575, t. 22. 



I'roviiloiico iloiiiitiiiiis {Cooper) luul oabtwiinl to S. IHiili iind tlio Itio (-iniadc ; also Mcxiciiii. 



12. GEUM, Linn. 

 Calyx persistent, concave ; limb 5-lobed, usually with 5 alternate bractlets, val- 

 vate. Petals 5. Stamens many. Carpels numerous, upon a conical or clavate 

 receptacle : style terminal, straight or geniculate : stigma small : ovules solitary, 

 ascending. Akenes small, compressed, caudate with the elongated naked or plumose 

 styles. Seed erect : radicle inferior. — Perennial herbs ; leaves mostly radical, 

 lyrate or jannate ; stipules adnate to the sheathing petioles; lU)wer.s rather large, 

 solitary or corymbijse. 



About 30 spccifs, di.stributeil througli tlie temi)erate and frigid zones. A dozen siu-iies occur 

 in the United States, several of them found also in N. Asia and Europe or closely ahied to Old 

 "World species. 



§ 1. Styles jointed and bent near the middle, the upper part deciduous, the lower 

 naked and hooked, iHConiini/ elongated : adyx lobes rejlexed. — CitUM pro|(er. 



1. G-. macrophyllum, Wilhl. A coarse herb : stems mostly solitary, 1 to 3 

 feet high, bristly-hairy, leafy : radical leaves lyrate and interruptedly junnate, six 

 inches to a focjt long or more, the terminal leaflet very large and round-cordate, 

 lobed and toothed, the lateral very unequal and often very small ; cauline leaves 

 similar but with a short rhachis, or reduced to the terminal leaflet ; stijiules larg(f, 

 toothed: Ilowers yellow, half an inch broad, in an open i)aiucle : bractlets of the 

 calyx small and oi'tiMi wanting: fruit hispid, upon a nearly naked oblong receptacle : 

 styles 3 lines h>ng, at length rellexed. 



In the Sierra Nevada, on the eastern side ; Mono I'a.ss {Boluvder), Sierra Co. (Lcmnwn), north 

 of Lassen's I'eak {Ncwbcrnj), and northward to Sitka, ranging east to the Atlantic. 



§ 2. Stijle slraiyhl, not jointed, and whoUi/ persistent, naked or jdnmose, elomjated : 

 cali/x- lobes not rejlexed. — Sii':vi;;usiA. 



2. Gr. triflorum, Pursh. Low, villous ; stems clustered, from stout branching 

 rootstocks, G to 15 inclies high, simple, nearly naked : radical leaves pinnate some- 

 what interruptedly Avith numerous cuneate-oblong incised segments ; the cauline 

 reduced to a few small lineardobod leaves or bracts : flowers largi', few, on long 

 peduncles : calyx often purplish, as well as the upper i)art of the stem, the linear 

 bractlets 4 to 9 lines long, usually excelling the lobes and equalling tln^ oblong 

 purplish erect jjetals : tails tif the small akenes jdumose, at length 2 or 3 imhes 

 long : receptacle small, liemispherical. — Sieveisia trijlora, K. Br.; Hook. r.ot. Mag. 

 t. 2858. 



In the Sierra Nevada at '1,0(10 to D.OOO feet altitude {llrcwci; Bolanda), and in the iiiounluins 

 north and eastward, to Arctic America and Lalirador. 



13. PRAGARIA, 'I'ourn. Si uawiikhuv. 

 Calyx persistent, concave ; limb 5-lobed, with 5 alternate bractlets, valvate. 

 Petals 5, white, spreading. Stamens many, in one row. Carpels numerous, smooth : 

 styles lateral, very short : ovule solitary, ascending. Tieceptacle much enlarged and 

 fleshy in fruit, conical, scarlet, bearing the small turgid crustaceous akenes upon the 

 surface. iJadicle superior. — Acaulescent stoloniferous perennials; leaves indmately 



