Voi,. II.] 



ROSE FAMILY. 



229 



A large genus, the number of species variously regarded, natives of the northern hemisphere. 

 Besides the following, about 6 others occur in the southern and western parts of North America. 



K- Styles cohering in a column; leaflets mostly 3. i. R. setigera. 



* & Styles all distinct; leaflets 5-11. 



Sepals persistent, erect on the fruit, or spreading. 

 Infrastipular spines generally none. 



Stems unarmed or nearly so; sepals erect on the fruit. 2. R. blanda. 



Stems armed with numerous pnckles. 



Leaflets 3-9, often resinous, obtuse at base; flowers solitary; sepals erect on the fruit. 



3. R. acicularis. 

 Leaflets 7-11, not resinous, narrowed at base; flowers corymbed; sepals spreading. 



Infrastipular spines commonly present; stems prickly. 

 Sepals deciduous, spreading. 



Leaflets finely serrate ; spines stout, recurved. 

 Leaflets coarsely serrate. 



Infrastipular spines slender, nearly straight; native bushy species. 

 Stems with scattered prickles or naked; flowers often solitary. 

 Stems very densely prickly; flowers usually solitary. 



4. R. Arkansana. 



5. R. Woodsii. 



6. R. Carolina. 



R. humilis. 

 R. nitida. 



Infrastipular spines stout, hooked; introduced wand-like or climbing species. 



Leaflets somewhat pubescent beneath, serrate. 9. R. canina. 



Leaflets very glandular beneath, doubly serrate. 10. R. rubiginosa. 



i. Rosa setigera Michx. Prairie Rose. 

 Climbing Rose. (Fig. 1965.) 



Rosa setigera Michx. Fl. Bor. Am. i: 295. 1803. 



Stems climbing, several feet long, armed with 

 scattered curved prickles, but not bristly. Petioles, 

 twigs and peduncles often glandular-pubescent; 

 stipules very narrow; leaflets 3, or sometimes 5, 

 mostly ovate, acute or obtusish at the apex, rounded 

 at the base, I'-j' long, sharply serrate; flowers co- 

 rymbose, about -2.%.' broad; sepals ovate, acute, at 

 length reflexed and deciduous, glandular; petals ob- 

 cordate, varying from rose-color to white; styles co- 

 hering in a glabrous column; fruit globose, 4 // -5 // 

 in diameter, more or less glandular. 



In thickets and on prairies, southern Ontario to Wis- 

 consin, West Virginia, Florida and Texas. Escaped 

 from cultivation in New Jersey and Virginia. June- 

 July. Called also Michigan Rose. 



2. Rosa blanda Ait. Smooth or 

 Meadow Rose. (Fig. 1966.) 



Rosa blanda Ait. Hort. Kew. 2: 202. 1789. 



Erect, low, 2-4 high; entirely unarmed 

 or with a few straight slender prickles on 

 the stem. Stipules rather broad; leaflets 

 5-7, short-stalked, usually pale beneath, 

 oval or obovate, obtuse at the apex, com- 

 monly narrowed or cuneate at the base, i'- 

 \% f long, simply and sharply serrate; flow- 

 ers pink, sometimes 3' broad, corymbose or 

 solitary; calyx-lobes lanceolate, acuminate, 

 entire, hispid-pubescent, persistent and 

 erect on the fruit; petals obovate, erose or 

 sometimes obcordate; styles separate; fruit 

 globose or pyriform, glabrous or nearly so, 

 about 5" in diameter. 



In moist, rocky places, Newfoundland to 

 Vermont and northern New Jersey, west to On- 

 tario and Illinois. June-July. 



