488 Rydberg: Notes on Rosaceae 



Geum aleppicum Jacq.* has been regarded as a synonym of G. 

 strictum. Being an older name it should have been substituted. 

 But I think that it is well distinct from the North American 

 plant. So are all specimens from Europe referred to G. strictum. 

 Whether they should all be included or not in G. aleppicum, I 

 could not tell, but it is evident that G. strictum should be excluded 

 from the flora of Europe and Asia Minor. 



Geum mexicanum Rydb. Specimens in habit much resembling 

 G. macrophyllum have been collected in southern Mexico. They 

 were also determined as that species. As G. macrophyllum has 

 not been collected at any station nearer than Sierra Nevada in 

 California, it is very improbable that that species should grow 

 in southern Mexico. A closer examination of these specimens 

 revealed that the petals and the fruit were essentially those of 

 G. strictum. As the. habit is quite different, a new species G. 

 mexicanum was proposed and based upon these specimens. To 

 this belong the following: 



Vera Cruz: Mount Orizaba, 1891, Henry E. Seaton 251. 



Hidalgo: Sierra de Pachuca, 1901, Rose ef Hay 5563; 1906, 

 Rose & Rose 11489. 



Geum urbanum L., a native of Europe and temperate Asia, 

 has been introduced in this country and is well established at 

 several places, especially at Cambridge, Massachusetts. 



Geum geniculatum Michx. The type locality of this species 

 was given as Canada. This must have been a mistake, for the 

 plant is known only from the mountain slopes of North Carolina 

 and eastern Tennessee. 



Geum rivale L. This is a native of North America as well as 

 Europe and Asia. Rafinesque thought that the American plant 

 was different and redescribed it as G. nutans Raf. As there was 

 an older G. nutans, Steudel proposed the name G. Rafinesquianum 

 for the American plant, but this was unnecessary as that and the 

 European one are identical. 



Hybrids 

 Hybrids in Geum are not unknown in Europe; why should 

 they be in America? Geum intermedium Ehrh., a hybrid of G. 



*Coll. 1: 80. 



