136 Rydberg: Notes on Rosaceae 



leaves (or leaflets if the leaf happens to be compound, which is 

 seldom the case). Ruhus Egglestonii differs more from R. strigosus, 

 viz., in the elliptic, obtuse, merely mucronate sepals, the slender 

 habit, and small leaves. In my opinion, it is a distinct species, 

 perhaps derived from R. strigosus, or perhaps a hybrid betsveen 

 the latter and Dalibarda repens L. The rarity of well-developed 

 fruit and the poorly developed pistils would suggest hybrid origin. 

 Botanists who have the chance of seeing it in the field are urged 

 to follow up this suggestion. 



Urticifolii 



Riihiis trichomalliis Schlecht. This has been merged into R. 

 urticifoliiis and Dr. Focke still regards it as synonymous with that 

 species, but I think that it should be held distinct. The South 

 American plant has a compact inflorescence and ovate sepals, 

 which are soon reflexed. The Mexican and Central American 

 plants on the contrary have a looser inflorescence, ovate, lanceolate 

 sepals, closing around the young fruit, and only in age becoming 

 spreading. The following specimens belong to R. trichomallus: 



Costa Rica: Santiago (east of Cartago), April 20, 1906, 

 Maxon 81; Vulcan Irazu, June 1874, 0. Kimtze (labeled R. cos- 

 taricanus); Turrialva, June 21, 1874, 0. Kuntze 2245. 



Riihus ferrugineus Wikst. This seems to have been a lost 

 species. However, it has been collected again on the same island 

 from which it was originally described, viz., Guadeloupe, but it 

 has been mistaken for R. janiaicensis, from which it is easily 

 distinguished by the long, non-glandular hairs on the stem. Only 

 one typical specimen has been collected outside of Guadeloupe, 

 and strange enough, this comes from Mexico. A plant very 

 closely related to it if not the same species is common in northern 

 South America, but in this the inflorescence is more open and the 

 sepals narrower. If not to be referred to R. ferrugineus it repre- 

 sents an undescribed species. The following specimens are referred 

 to R. ferrugineus. 



Guadeloupe: 1893, Pere Duss 2215. 



Mexico: near Tunbala, Chiapas, October 26, 1895, E. W. 

 Nelson 3305. 



