Rydberg: Notes on Rosaceae 157 



Ruhiis heterophyllus Willd. This is related to R. proctimbens, 

 but differs in the incised toothing of the leaves. It is not so 

 common. R. heterophyllus was for a long time a so-called "lost" 

 species. Nobody seemed to know what it was. Bailey thought 

 that it must have been a hybrid of R. procumbens. For some 

 time, I held the opinion that it must be either R. procumbens or 

 else R. villosus michigatiensis Card. The latter was described 

 independently by Blanchard as a species under the name R. 

 geophilus, though the type of the latter has less harsh leaves than 

 usual. A photograph of the type of R. heterophyllus was kindly 

 sent me from the Botanical Garden at Berlin, and this shows, 

 without doubt, that it is the same as R. villosus michiganensis 

 and R. geophilus. 



Rubus flagellaris Willd. This species has also been lost for 

 about one hundred years. Professor Bailey thought that it was 

 not American, at least no specimens had he seen in any of the 

 herbaria, and I have not seen any but those collected by Mr. 

 Bicknell, who rediscovered it on Long Island and Nantucket 

 Island. Some of his specimens match closely the illustration 

 prepared by Professor Bailey from the type. It also agrees with 

 Willdenow's description. 



Rubus procumbens Muhl. This name appears first in Muhlen- 

 berg's catalogue of 1813, without a description. It was given as 

 a synonym under R. trivialis in Bigelow's Florula Bostoniensis in 

 1914, Bigelow mistaking this species for R. trivialis Michx. The 

 first description under the name R. procumbens appeared in Barton's 

 Flora of Philadelphia. Torrey and Gray mistook it for Rubus 

 canadensis. This mistake was pointed out by Professor Bailey, 

 who adopted the name R. villosus Ait., not believing that the more 

 pubescent plant, R. plicatif alius, was distinct. R. villosus, how- 

 ever, is not available, as there was an older R. villosus Thunb. 

 I myself thought that R. procumbens Muhl. was the pubescent 

 plant, wherefore I redescribed the present species under the name 

 R. subuniflorus. It is evident, however, that Barton described 

 the glabrate plant. R. procumbens is the most widely distributed 

 of our dewberries. 



Rubus Enslenii Tratt. This is mainly a southern species 

 extending along the coast as far up as to Nantucket Island. 



