82 bosace^. (ROSE family.) 



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

 lower naked and hooked, becoming elongated : calyx-lobes rejlexed. — In ours 

 the petals are golden- yellow, broadly obovate, exceeding the calyx. 



1. G. macrophyllum, Willd. Bristly-hairy, stout (1 to 3 feet high): 

 rootrleaves lyrately and interruptedly pinnate, with the terminal leaflet very 

 large and round heart-shaped; lateral leaflets of the stem-leaves 2 to 4, minute, 

 the terminal roundish, 3-cleft, the lobes wedge-form and rounded : receptacle of the 

 fruit nearly naked. — From the Sierra Nevada to the Atlantic, and northward 

 to Sitka. 



2. G. strictum, Ait. Somewhat hairy (3 to 5 feet high) : root-leaves 

 interruptedly pinnate, the leaflets wedge-obovate ; leaflets of the stem-leaves 3 to 5, 

 rhombic-ovate or oblong, acute: receptacle of fruit downy. — From Colorado 

 northward, and eastward to the Atlantic. 



§ 2. Style jointed and bent in the middle, the upper joint plumose : flowers large : 

 calyx erect or spreading. 



3. G. rivale, L. Stems nearly simple : root-leaves lyrate and interrupt- 

 edly pinnate ; those of the stem few, 3-foliolate or 3-lobed : calyx brown purple : 

 petals dilated-obovate, retuse, contracted into a claw, purplish orange : head 

 of fruit stalked in the calyx. — Colorado, W. Montana, and northward ; also 

 eastward to Newfoundland. 



§ 3. Style not jointed, wholly persistent and straight : head of fruit sessile : flowers 

 large : calyx erect or spreading. — Flowering stems simple and bearing only 

 bracts or small leaves. 



4. G. triflorum, Pursh. Low, softly-hairy : root-leaves interruptedly 

 pinnate; the leaflets very numerous and crowded, oblong wedge-form, deeply 

 cut-toothed: flowers 3 or more on long peduncles: bractlets linear, longer than 

 the purple calyx, as long as the oblong purplish erect petals : styles very long, 

 strongly plumose in fruit. — In the mountains from the Sierra Nevada north- 

 ward and eastward to Arctic America and Labrador. 



5. G. Rossii, Seringe. Slightly pubescent above: root-leaves interrupt- 

 edly pinnate, rather glabrous, minutely ciliate ; leaflets ovate or cuneiform, 

 2 to 3-lobed, incised or entire: scape l-flowered: calyx-lobes shorter than the 

 roundish yellow petals : styles glabrous, not exserled in fruit. — Alpine. High 

 peaks of Colorado and W. Montana, and northward through Arctic America. 



Var. humile, Torr. & Gray. More pubescent, almost silky when young, 

 somewhat larger : leaflets more numerous and crowded : scape sometimes 2-flow- 

 3 red. — Fl. i. 424. Colorado, Nevada, and northward to Oonalaska. 



15. PR AG ARIA, Tourn. Strawberry. 



Petals 5, white, spreading. Stamens many in one row. — Acaulescent sto- 

 loniferous perennials : leaves palmately trifoliolate ; the leaflets obovate-cune- 

 ate, coarsely toothed : flowers few, cymose upon short erect scapes. 



1. I". Virginiana, Duchesne. Akenes imbedded in the deeply pitted fruit- 

 ing receptacle, which usually has a narrow neck : calyx becoming erect after 

 flowering and connivent over the hairy receptacle when sterile or unfructified : 

 leaflets of a firm or coriaceous texture : the hairs of the scape and especially of 

 the pedicels silky and oppressed. — The species seems to be confined to the 

 Atlantic States. 



