RYDBERG: NOTES ON ROSACEAE 487 
Geum ovregonense (Scheutz) Rydb. This was originally de- 
scribed as a variety of G. urbanum to which it is not closely related. 
Its relationship is with G. macrophyllum. Usually it is well dis- 
tinguished from that species by its open inflorescence, smaller 
stem-leaves and smaller and usually paler petals, but intermediate 
forms are not lacking. Some of these at least may be regarded 
as hybrids. Geum oregonense is common throughout the Rocky 
Mountains, as well as the Sierra Nevada and the Cascades. In 
the southern Rockies, G. macrophylium is not found, but it extends 
east to northern New England, where G. oregonense is not found 
at all. In California the characters separating the two species 
seem to be less marked, and considerable questionable material 
has been seen. 
Geum perincisus Rydb. Many subarctic specimens which 
might have been referred to G. oregonense have the upper leaves 
deeply incised and the petals broader and in form approaching 
those of G. strictum. It is hard to say whether these should be 
regarded as a variety of G. oregonense or as a distinct species. 
I adopted the latter view, because all these specimens were far 
northern ones and some of them found much further east than 
any of the typical G. oregonense. The following specimens belong 
ere; 
ALASKA: Eagle, Yukon Valley, 1902, Arthur Collier 34, 35; 
Copper River region, 1902, William L. Poto 147. 
Yukon: Fort Selkirk, 1899, Tarleton 120. 
MACKENZIE: Fort Simpson, 1861-62, Onion, Kennicott & Har- 
disty; Fort Resolution, 1901, Preble & Preble 154. 
ALBERTA: Cave Avenue, Banff, McCalla 2074. 
MIcHIGAN: Turin, 1901, Barlow. 
Geum strictum Ait. is a very variable species. Usually the 
terminal leaflet is more or less rhombic, as it is commonly described, 
but not seldom it is rounded or subreniform as it is in G. macro- 
bhyllum or G. oregonense. It usually can be easily distinguished 
by its large rounded petals and always by its fruit. The lower 
portion of the style is never glandular and the upper portion has 
hairs about twice as long as those of the other two species. Geum 
scopulorum is the common form of G. strictum in the Rockies, a 
little less robust than in the East. 
