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, 1 
could not tell, but it is evident that G. strictum should be So 
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. 
HipaLco: Sierra de Pachuca, 1901, Rose & 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. 
Hysrips 
Hybrids in Gewm are not unknown in Europe; why should 
they be in America? Geum intermedium Ehrh., a hybrid of G. 
* Coll, zt: 80. errs epee 
