34 



Opulasier opulifolius (L.) OK. Kev. Gen. 949. (1891) 

 Spiraea opulifolia L. Spec. PI. 489. (1753) 

 Fhysocarpus opulifoliua Maxim. 



Opulaster Med. was' established on this species in 1799, 

 Physacarpus Camp, as a section of Spiraea in 1824. - 

 Bosa virginiana Miller Diet. (1768) 



Eosa blanda Ait. Hort. Kew. II., 202. (1789) 

 Bosa virginiana arkansana (Porter) MacM. Met. Minn. Vail. 

 304, (1892). 

 Eosa arkansana Porter Fl. Col. 88. (1874) 

 Fragaria vesca americana Porter Bull. Torr. Bot. Club XVII. , 

 15. (1890) 

 Fragaria vesca Auct. Am., not Linne. 



The American variety differs somewhat from the European, 

 especially in its thinner and smoother leaves, but I do 

 not think sufficiently to justify a new species. Dr. Brit- 

 ton in Bull. Torr Bot. Club 1892, page 222, makes of it a 

 species and points out as a distinctive character that the 

 achenes are superficial, "which are scarcely or not at all 

 imbedded in the ovoid fruit." But so they are in the 

 European F. vesca. DeCandolle and other European bot- 

 anists use this very character to distinguish F. vesca from 

 F. elatior and F. virginiana. 

 Geum canadense J acq. Hort. Vind. II., 82. (1772) 



Not Oeum canadense Murr. Con. Goett. V., 34. (1790) 

 Geum album Gmelin Syst. II., 861. (1791) 

 Potentilla gracilis chrysantha ( Lehm. ) 



Potentilla chrysantha Lehm. Hook. Fl. Bor. Am. I., 193. 



(1833), not P. chrysantha Trev., which is older. 

 Potentilla rigida Nutt. Journ. Acad. Philad. VII., 20 (1833) 



Not P. rigida Wall., which is older. 

 Potentilla gracilis rigida Wats. Eev. Potentilla 557. 

 If this is to be regarded as a variety of P. gracilis, which I 

 believe it should, the varietal name must be chrysantha. 



