150 Rydberg: Notes on Rosaceae 



Dr. Porter described this variety and compared it with R. villosus 

 he did not mean by the latter R. Andrewsianus or R. argutus, for 

 the glandular plant was well known to him. Even Professor 

 Bailey held R. allegheniensis distinct. When Dr. Porter pointed 

 out as the only differences the narrow dry fruit with its peculiar 

 aroma and did not mention the presence of glands, it is evident 

 enough that both were glandular, for Dr. Porter was too acute an 

 observer not to notice the difference in pubescence between R. 

 nigrohaccus and R. argutus. I am inclined rather to follow Porter's 

 and Bailey's view and regard R. allegheniensis as a distinct species. 

 Furthermore, Mr. Mackenzie, who is well acquainted with R. 

 nigrohaccus, has collected R. allegheniensis in New Jersey and 

 distributed it under a manuscript name, regarding it as distinct. 

 The latter differs in the slender terete stem, the narrower leaflets 

 on the new shoots usually acute instead of rounded or subcordate 

 at the base, the narrower and drier fruit and the conspicuous 

 yellow glands and smaller flowers. It is a rare plant, suggesting 

 somewhat R. canadensis or R. Randii. Dr. Britton, noticing that 

 the figures of R. allegheniensis in the first edition of the Illustrated 

 Flora, poorly represented the common, glandular high black- 

 berry had a new illustration made, evidently overlooking the fact 

 that the original illustration was made from the type of R. alle- 

 gheniensis Porter. As it is. Fig. iSqq in the first edition illustrates 

 the original R. allegheniensis, while Fig. 2300 in the second edition 

 is a good illustration of R. nigrohaccus. 



Sometimes, especially in the north, R. nigrohaccus has a leafy- 

 bracted inflorescence and then receives a very different aspect. 

 Such specimens in flower may be taken for a distinct species, but 

 there is no difference in the pubescence or in the leaf forms. It 

 might be mistaken for a hybrid with R.frondosus, but that species 

 is unknown in the region where these forms are most common. 

 Such specimens are : 



Quebec: island in Gatineau River, near Chelsea, 1906, Rydherg 



7933- 



Ontario: Ottawa, 1903, Macoun 59967. 



Nova Scotia: Yarmouth, 1901, Howe & Lang 89, 107; 

 Halifax Harbor, Howe 6f Lang 1594. 



Ruhus allegheniensis Porter. See discussion^ under R. nigro- 



