496 KOSACKAK (IJOSE FAMILY) 



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

 the outer lohed. {R. arkansana of aiith., not Porter.) — Prairies, etc., Man. to 

 Mont., s. to Mo. and Tex. 



4. R. bldnda 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; Howers 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. 8tem.s 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 lohed ; fruit globose, with a short neck, — Minn, to 

 Mo., westw. and northwestw\ 



6. R. spiNosfssiM.A. 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. (Introd. from Eurasia.) 



7. R. cinnam6me A L. (Cixxamox R.) Stems flexuous. reddish bro^vn, 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. CAxixA L. (Dog 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-pub erul ent ; flowers soli- 

 tary (or 2-4) on usually naked pedicels ; sepals pinnatifid; fruit osoid 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 Wcudl. (Macartxy R. ) Leaflets mostly 7, narrowly 

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

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

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

 (Introd. from Asia.) 



10. R. RUBiGix6sA L. (SwEETBRiER, Eglaxtixe.) Armed ^\\\\\ 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 En.) 



Var. MicRAXTHA (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. GAL MCA L. Erect, 1-1.6 ra. high ; stem glandular-hi.spid and armed 

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

 rounded or obtusi.sh 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 En.) 



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

 slender infra-stipular prid-les scarcdy stout<'r than those irhich 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) ; sfpals 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, 



