144 



to7it cnscvihlc than by any single character that a correct knowl- 

 edge of its position is to be attained. 



CLASSIFICATION. 



Rosa, Tourn. 



Group Cinnamomk v.,* Ckkpin. 



Styles free, includoJ ; insertion of the ovules basilo-parietal ; sepals usually 

 erect and persistenl on the matured fruit ; inflorescence unilloral or multilloral, 

 with a dilated bract on tlie primary peth'cels ; spines sirai[;ht or curved, y;cmi- 

 nate or alternate, usually minp^led with sctnccons prickles, rarely unarmed ; stem 

 erect or ascending ; stipules adnate to the common petiole ; leaflets 5 to 9 on 

 flowerin^j branches. 



Sub-Group GYMNOrARiMi : sepals early deciduous with the apex of the 

 fruit ; stems more or less prickly. 



1. Rosa gyviuocar^a, 



Sub-Croup Ali'IN.i-: : sepals erect and persistent on matured fruit ; steins 

 either smooth or armed with scattered prickles, rarely with geminate spines. 



2. Rosa hlanJa, 



3. Rosa blanda^ var. Ayhansaiia, 



4. Rosa acicularh. ' 



Sub-Group KuriNNAMoMK-K : sepals erect and persistent on matured fruit : 

 stems armed with geminate, rarely alternate spines ; more or less prickly. 



5. Rosa Nutkana, 



6. Rosa JyisocarJ>a. 



7. Rosa Californica. 



8. ? Rosa spit Jiaincca, 



T. Rosa gymnocarpa^ Nuttall, 1840, ranges from British Co- 

 lumbia to Cahfornia, and eastward to Idaho and Montana. Its 

 pecuh'ar dehiscence, so far as is known, distinguislies it from all 

 other North American roses. Two Asiatic species, Rosa Albcrti, 

 Regcl (1S83), and Rosa Bcggcriaiia, Schretick (1841), are, as I 

 am informed by M. Crcpin, the only roses of this sub-group in 

 the Old World. To know the actual relations of these three 

 closely allied species would be extremely interesting. 



2. Rosa blanda, Aiton 1789 {? R. Virginiana, Miller, 1768) 

 ranges from Newfoundland westward through Quebec, Ontario, 

 New York, to Wisconsin and Illinois, where it passes into var. 

 Arkansana. The stem of the type is either smooth or sparingly 



■ 



prickly; the sepals, stipules and leaflets rarely glandular. It is 

 distinguished from the Carolina^ by the absence of geminate spines, 

 by its erect, persistent sepals and by the basilo-parictal insertion 

 of its ovules. 



■^Journal of the Royal Hurt. Sue. Part III. Vol. XT., Oct. 1889, 



