﻿142 Rydberg: Notes on Rosaceae 



Ruhus abundus Rydb. This name was substituted for R. 

 fiorihundus H.B.K., which is a homonym. This has been reported 

 for Central America, but I have not seen any material from there ; 

 I have, however, seen several specimens from Venezuela and Col- 

 ombia. Otto Kuntze collected the species near Caracas, but 

 referred it to varieties of R. jamaicensis. The following varietal 

 names appear on his labels: fiorihundus, normalis, and nudicaulis. 

 Though related to R. jamaicensis, it is easily distinguished from 

 the same by its densely villous-velutinous leaves, which are deeply 

 cordate at the base and never white on the lower side, and by its 

 dense inflorescence and ovate, instead of lanceolate, sepals. Dr. 

 Focke described a subspecies Selerianus of this species from 

 material collected in Mexico, Seler 2og6, which I have not seen. 



Ruhus laxus Rydb. was described in the North American Flora. 

 It was also described by Dr. Focke as Ruhus adenotrichos leptaleos,* 

 but is not related to R. adenotrichos. It is related to the preceding, 

 but differs in the open inflorescence, divergent branches of the 

 same, the smaller flowers, the narrower and less or not at all cordate 

 leaflets and shorter and finer pubescence. Specimens seen are 

 the following: 



Guatemala: Zamorora, Dept. Santa Rosa, Heyde &■ Lux 

 4474; Volcan Jumaytepeque, Santa Rosa, Heyde & Lux 4473. 



Ruhus jamaicensis L. This seems to be confined to the island 

 of Jamaica. Specimens so named from South America belong to 

 R. ahundus, R. alpinus, or other related species. Mr. John Hart, 

 Superintendent of the Cinchona Plantation, has collected speci- 

 mens with the terminal leaflet of the lower leaves very broadly 

 cordate and the inflorescence more compact. These approach 

 somewhat R. ahundus. 



Ruhus alpinus Macf. Unfortunately, I have not seen the 

 original description published by Macfadyen. The descriptions 

 given by Grisebach and by Focke do not fully agree. The former 

 describes the plant, as well as R. jamaicensis, as shrubby, trailing, 

 and the drupelets as numerous ; the latter describes the plant as 

 climbing and the drupelets as twenty to thirty. The plant 

 found in Jamaica and the only one which agrees in any 

 way with the descriptions of R. alpinus is a plant closely 



