468 Rydberg: Notes on Rosaceae 



Virginia: White Top Mountain, 1908, Rydberg 8104; be- 

 tween Marion and White Top Mountains, Rydberg 8138. 



North Carolina: Graham County, 1 Sgy , Biltmore Herbarium 

 1307c. 



New Brunswick: Grand Falls, Macoun 21181. 



Rubus amicalis X nigrobaccus. Comparing the specimens re- 

 ferred here with R. canadensis X nigrobaccus, I came to the con- 

 clusion that this must be a hybrid of the species mentioned. 

 They were collected by Arthur at Isle au Haut, Maine. 



Rubus nigrobaccus X Randii. This was first recognized by 

 myself while collecting in the Adirondacks. Both parents grew 

 in the vicinity. Subsequently I thought it was the same as R. 

 frondisentis Blanchard, but I have found it is not. None except 

 the original specimens have been seen. 



Rubus nigrobaccus X pergratiis. The following specimens I 

 think belong to this hybrid. They were collected near the type 

 locality of R. amicalis X nigrobaccus. Rubus pergratus is also 

 common in the region. 



Maine: Isle au Haut, 1909, Arthur 33, 56. 



Rubus heterophyllus X nigrobaccus. I have no evidence that 

 the specimens referred here belong to a hybrid except that the plant 

 combines the habit and glandular pubescence of R. nigrobaccus 

 with the leaf cut of R. heterophyllus. The original specimens are 

 the only ones seen. 



Rubus nigricans X nigrobaccus. This I collected at Kings- 

 mere Lake, Quebec, where both R. nigricans and R. nigrobaccus 

 were growing. I have no doubt but my specimens were of hybrid 

 origin. I cannot distinguish them from specimens of R. glandi- 

 caulis distributed by Mr. Blanchard. R. biformispinus Blan- 

 chard I think is also a hybrid of the same two species, though 

 approaching R. nigricans more than R. nigrobaccus. The following 

 specimens belong here: 



Quebec: Kingsmere Lake, 1906, Rydberg 7946. 



New Brunswick: Fredericks town, Blanchard 606. 



Maine : Yarmouth, 1909, Blanchard 507; Brownville, Blanchard 

 508; Bar Harbor, Blanchard 509; Calais, Blanchard 510; Isle au 

 Haut, 1909, Arthur 52; Kcnnebunk, 1905, Blanchard 74, Sets i, 

 2; Kennebunkport, 1905, Blanchard 79. 



