496 ROSACEAE (KOSE FAMILY) 



veined, simply toothed, not resinous ; flowers corymbose ; sepals rarely hispid, 

 the outer lobed. (jR. arkansana of auth., not Porter.) Prairies, etc., Man. to 

 Mont., s. to Mo. and Tex. 



4. R. blanda Ait. Stems 3-15 dm. high, wholly unarmed or occasionally 

 covered with numerous prickles ; stipules dilated, naked and entire or slightly 

 glandular-toothed ; leaflets 5-7, usually oblong-lanceolate, thinner and less 

 strongly veined than in the preceding, cuueate at base and petiolulate, simply 

 serrate, not resinous ; flowers usually large, corymbose or solitary ; sepals his- 

 pid, entire. On rocks and shores, Nfd. to N. E., and westw. chiefly in the 

 region of the Great Lakes to Mo. and Assina. 



5. R. Wo6dsii Lindl. Stems usually low (1-9 dm. high) , with slender straight 

 or recurved prickles, or wholly unarmed 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. , westw. and north westw. 



6. R. spiNOsfssiMA L. (SCOTCH R.) Low spreading shrub; stems densely 

 covered with long straightish prickles and innumerable shorter ones ; leaflets 

 7-13, small, broadly elliptic to suborbicular, glabrous or nearly so ; stipules very 

 small; fruit globular, black. Often cultivated, and inclined to spread from 

 old gardens, N. E., Ont., etc. (Iritrod. from Eurasia.) 



7. R. CINNAM6MEA L. (CINNAMON R.) Stems flexuous, reddish brown, armed 

 with pairs of light-colored broad-based slightly recurved infra-stipular prickles ; 

 leaflets rather narrowly elliptical, 2-3 cm. long, paler beneath, sharply and 

 finely serrate; flowers commonly double. Once much cultivated, and now 

 established in hedgerows, etc. (Introd. from Eurasia.) 



8. R. CANINA L. (Doc R.) Stems armed with stout recurved prickles, the 

 branches sometimes unarmed ; leaflets 5-7, elliptical or oblong-ovate, glabrous 

 or somewhat pubescent, simply toothed, not resinous-puberulent ; flowers soli- 

 tary (or 2-4) on usually naked pedicels ; sepals pinnatifld; fruit ovoid or nearly 

 globular. A casual escape from cultivation, Mass, to Tenn.; thoroughly natu- 

 ralized on river-banks in Pa. (Porter}. (Introd. from Eurasia.) 



9. R. BRACTEATA Wendl. (MACARTNY R.) Leaflets mostly 7, narrowly 

 obovate, rounded at the apex, thick, shining, evergreen, glabrous; flowers 

 large; calyx densely villous-tomentose ; petals mostly white. Cultivated from 

 China, extensively naturalized in parts of the Southern States, extending to Va. 

 (Introd. from Asia.) 



10. R. RUBiGm6sA L. (SWEETBRIER, EGLANTINE.) Armed with strong 

 hooked mostly infra-stipular prickles (with or without scattered smaller ones) ; 

 leaflets densely resinous beneath and aromatic, doubly serrate ; the short pedi- 

 cels and pinnatifid sepals hispid ; flowers pink, mostly 3-4 cm. in diameter ; fruit 

 obovate. Rocky pastures, etc., common. (Introd. from Eu.) 



Var. MICRANTHA (Sm.) Lindl. Leaves less glandular, nearly scentless, flow- 

 ers smaller (about 2-2.5 cm. in diameter) and paler; fruit somewhat flask- 

 shaped. Along roadsides, etc., e. Mass. (Introd. from Eng.) Inconstant and 

 suggesting relationship to no. 8. 



11. R. GALLIC A L. Erect, 1-1.6 m. high ; stem glandular-hispid and armed 

 with straightish slender prickles; leaflets 3-5, broadly elliptic, cordate at base, 

 rounded or obtusish at apex, doubly glandular-serrate; flowers large, mostly 

 deep red and double. Often cultivated, and now well established in roadside 

 thickets, N. E., O., and probably elsewhere. (Introd. from Eu.) 



12. R. nftida Willd. Low, nearly or quite glabrous throughout, the straight 

 slender infra-stipular prickles scarcely stouter than those which usually thickly 

 cover the stem and branches ; stipules mostly dilated ; leaflets bright green and 

 shining, usually narrow-oblong and acute at each end ; flowers solitary (rarely 

 2-3) ; sepals entire. Margins of swamps, Nfd. to N. E. 



13. R. Carolina L. Stems .usually tall (3-25 dm. high), with stout straight 

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

 6-9 (mostly 7), finely serrate, dull green, usually narrow-oblong and acute at 

 each end and petiolulate, but often broader, usually pubescent beneath. Bor- 

 ders of swamps and streams, N. S. to Fla., w. to Minn, and Miss. 



