217 



P. insititia, L. ; Eng. Bot. ed. 3, t. 409. Europe, Orient, 



''iiullace." 



P. italica, Borkh. var. flore pleno. Origin uncertain. 

 Polypetalia speciosa, Hort. 



P. maritima. Wanqenli. ; Britt. & Br. Illustr. Flora ii. 

 249, f.' East United States. " Beach Plum." 



P. acuminata, Michx. (not Hook./.). 

 Var. fructu luteo. 



P. monticola, C. Koch. Asia Minor. 



P. nigra, .4//. ; Sargent Silva of North America t. 149. 

 North America, &c. " Canada Plum, Red Plum." 



P. orthosepala, Koehne. Texas. 



P. plantierensis, Hort. ? A cultivated form of P. cerasifera. 



P. spinosa, L. ; Eng. Bot. ed. 3, t. 40S. Europe, North 

 Asia. " Sloe, Blackthorn." 



P. fruticans, Weihe. 

 Var. flore pleno. 



P. tarda, Sargent. Eastern Texas. 



P. triflora, Uoxh. China, &c. " Japanese Plum." 

 P. japonica, Hort. (not Thunb.). 



P. Watsoni, Sargent Garden and Forest 1804, IM f. 25. 

 Nebraska to Arkansas. " Sand Plum." 



P. angustifolia var. Watsoni, Waugh. 



tttt Cerasus. 



P. acida, Borkh. Europe. 

 Cerasus acida, Dinn. 

 C. caproniana, DC. 



