(ROSE FAMILY.) 163 



quberulent and teeth serrulate ; flowers large, solitary (very rarely 2 or 3); outer 

 sepals usually with 1 or 2 narrow lateral lobes, not hispid. N. Mich, and 

 Wise, to Minn, and Col. 



5. R. Arkansana, Porter. Stems low, very prickly ; stipules narrow, 

 more or less glandular-toothed above (or even glandular-ciliate) ; leaflets 7-11, 

 broadly elliptical to oblong-oblanceolate, subcuneate at base, sessile or petiolulate, 

 timply toothed, not resinous ; flowers corymbose ; sepals rarely hispid, the outer 

 lobed. Minn, to Mo. and W. Tex., west to Col. 



-- -H- Fruit globose ; infrastipular spines present. 



6. R. Wobdsii, Lindl. Stems usually low (-3 high), with slender 

 straight or recurved spines, sometimes with scattered prickles, or wholly un- 

 armed above ; leaflets 5-7, obovate to oblong or lanceolate, more or less toothed; 

 flowers corymbose or solitary; sepals naked or hispid, the outer usually lobed; 

 fruit globose with a short neck. Minn, to Mo., west to Col. 



* * * 'Styles distinct ; sepals spreading after flowering and deciduous ; infra- 

 stipular spines usually present, often with scattered prickles ; sepals, globose 

 receptacle, and pedicel usually hispid ; teeth simple ; pubescence not resinous. 



*- Leaflets mostly flnely many-toothed. 



7. R. Carolina, L. Stems usually tall (1 - 7 high), with stout straight 

 or usually more or less curved spines ; stipules long and very narrow ; leaflets 

 dull green, 5-9 (usually 7), usually narrowly oblong and acute at each end 

 and petiolulate, but often broader, usually pubescent beneath. Borders of 

 wamps and streams, N. Scotia to Fla., west to Minn, and Miss. 



4- -i- Leaflets coarsely toothed. 



8. R. Iticida, Ehrh. Stems often tall and stout (a few inches to 6 high), 

 with at length stout and usually more or less hooked spines ; stipules usually 

 naked, more or less dilated ; leaflets (mostly 7) dark green, rather thick, smooth 

 and often shining above ; flowers corymbose or solitary ; outer sepals frequently 

 with 1 or 2 small lobes. Margins of swamps or moist places, Newf. to 

 N. Eng., N. Y., and E. Penn. 



9. R. humilis, Marsh. Stems usually low (1-3) and more slender, 

 less leafy, with straight slender spines, spreading or sometimes reflexed ; sti- 

 pules narrow, rarely somewhat dilated ; leaflets as in the last, but usually thin- 

 ner and paler ; flowers very often solitary ; outer sepals always more or less 

 lobed. (B. lucida of most authors.) Mostly in dry soil or on rocky slopes, 

 Maine to Ga., west to Minn., Mo., Ind. Terr., and La. 



10. R. nitida, Willd. Low, nearly or quite glabrous throughout, the straight 

 slender spines often scarcely stouter than the prickles which usually thickly cover 

 the stem and branches; stipules mostly dilated ; leaflets bright green and shin- 

 ing, usually narrowly oblong and acute at each end ; flowers solitary (rarely 2 

 or 3) ; sepals entire. Margins of swamps, Newf. to N. Eng. 



.Naturalized species. 



R. CANINA, L. (DoG B<SE.) Stems armed with stout recurved spines, 



without prickles, the branches sometimes unarmed ; leaflets 5 - 7, elliptical or 



oblong-ovate, glabrous or so mewhat pubescent, simply toothed, not resinous- 



puberulent ; flowers solitary (or 2 - 4) on usually naked pedicels ; sepals pin- 



8 



