53. ROSACEAE 119 



5, pubescent beneath; flowers usually solitary, "double"; 

 shrubs persistins^ after cult, or occasionally apparently spon- 

 taneous, but not established in 111.; native of Eur. June. 

 R. gallica L. 



4. Stems with stout prickles; leaflets 5-9; flowers usually 

 corymbose. 

 5. Leaflets doubly serrate with gland-tipped teeth, pubescent 

 or more or less glandular beneath; sepals glandular- 

 hispid on the back; pedicels usually glandular-hispid. 



6. Leaflets suborbicular to broadly oval, obtuse or acutish, 



pubescent and glandular beneath, fragrant; styles 

 pubescent; sepals tardily deciduous from the mature 

 fruit, or sometimes long-persistent; roadsides and 

 fields, nat. from Eur. Jvme. [R. ruhiginosa L.] Sweet- 

 briar R. eglanteria L. 



6. Leaflets ovate or oval, acute or short-acuminate, more or 

 less pubescent on both sides, more or less glandular 

 beneath; styles glabrous or nearly so: sepals soon 

 deciduous from the mature friut; roadsides and pas- 

 tures, occasional; native of Eur. June 



R. micrantha Sm. 



5. Leaflets simply and sharply serrate, glabrous on both sides, 

 glossy above, rarely slightly glandular on the midrib 

 beneath, oval or ovate, acute; styles pubescent; sepals 

 glabrous on the back, in fruit reflexed and tardily decidu- 

 ous, two or more of them usually pinnately lobed; road- 

 sides and fields, occasional; nat. from Eur. June. Dog 



Rose R. cayiina L. 



3. Achenes confined to the bottom of the receptacle. 



7. Sepals reflexed after flowering and deciduous from the 

 mature fruit. 

 8. Tall shrubs 1-2 m high; leaflets beneath (and rachis) 

 softly pubescent, closely serrulate, acute at each end; 

 stipules linear, more or less involute; prickles usually 

 more or less curved, flattened at the base; moist thickets 

 or swampy ground, local. Jime-July. Swamp Rose. 

 [R. Carolina of auth., non L.] R. palustris Marsh. 



8. Low shrubs 20-75 cm tall; leaflets rather coarsely serrate, 



glabrous, or pubescent only on the veins beneath; in- 

 frastipular prickles usually present, straight; stipules 

 oblanceolate ; dry soil along roads or edges of woods, 

 the common species throughout 111. May-Aug. Pasture 

 Rose. [R. hurnilis Marsh.; R. virginiana of auth., non 



Mill.] R. Carolina L. 



7. Sepals erect and connivent or spreading aftci- flowering, per- 

 sistent on the mature fruit. 



9. Flowers mostly corymbose; native species. 



10. Tall shrubs 1-2 m high, the branches usually without 

 prickles; hypanthium usually smooth, but the sepals 



