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RYDBERG: NOTES ON ROSACEAE 491 
the junctions with the hard persistent lower portion, but there is 
no marked articulation at this point as there is in Geum. 
As to the limitation of the species, it is impossible for me to 
follow Dr. Greene in his segregation. The original two species of 
Pursh’s Geum triflorum and Geum ciliatum are apparently well 
distinct; the intermediate forms may be hybrids. Erythrocoma 
campanulata Greene seems also to be a good species. In the 
North American Flora I also admitted Sieversia grisea (Greene) 
Rydb., S. canescens (Greene) Rydb., S. flavula (Greene) Rydb. 
and 5S. brevifolia (Greene) Rydb. If the first two really are specif- 
ically distinct from S. triflera (Pursh) R. Br. and the last two from 
S. ciliata (Pursh) G. Don is questionable. The other species of 
Erythrocoma of Greene are nothing but forms of those mentioned, 
due to local conditions. 
Steversia pentapetala (L.) Greene (S. anemonoides Willd.) is an 
Asiatic species reported for America only from the Aleutian 
Islands. The only specimens I have seen from this region were 
collected by Dall. 
Sieversia glacialis (R. Br.) Spreng. This species has the floral 
characters of the genus Erythrocoma Greene, but the habit suggests 
the species of Acomastylis. Some of the specimens are as follows: 
ALASKA: York Plateau, near Ip-muk, Port Clarence, IgoI, 
Walpole 1906; Port Clarence, 1901, Collier. 
SIBERIA: Whalen, 1894, J. T. White. 
Sieversia campanulata (Greene) Rydb. is the best species of 
Erythrocoma described by Dr. Greene. The broad reddish petals 
much exceeding the obtusish sepals and bractlets. It seems to be 
confined to the Olympic Mountains. The following specimens 
belong here: 
WaAsHINGTON: Olympic Mountains, Elmer 2520; Wilkes Expe- 
dition 352, 813 in part. 
Sieversia triflora (Pursh) R. Br. This is distinguished from 
S. ciliata (Pursh) G. Don in the broader, less deeply cleft leaflets 
and the more persistent style-tips, as pointed out by C. P. Smith, 
but there is another character which seems to have been over- 
looked. In all the other species referred to Erythrocoma, the 
hypanthium is rounded or even sunken at the base, even at flower- 
ing time, and the bractlets are not much, if any, exceeding the 
