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 

 campanitlata 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 S. brevifolia (Greene) Rydb. If the first two really are specif- 

 ically distinct from 5. triflora (Pursh) R. Br. and the last two from 

 5". ciliata (Pursh) G. Don is questionable. The other species of 

 Erythrocoma of Greene are nothing but forms of those mentioned, 

 due to local conditions. 



Sieversia 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, 1901, 

 Walpole 1906; Port Clarence, 1901, Collier. 



Siberia: Whalen, 1894, /. 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: 



Washington: Olympic Mountains, Elmer 2529; Wilkes Expe- 

 dition 352, 8ij 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 



