SEGREGATES FROM SIEVERSIA. 1%5 
The type that has been called Geum triflorum and Sieversia tri- 
Jora, differs from the last named as far as possible in aspect. The 
accrescent and plumose character of the styles it has in common 
with Szeversta, but its flowers are so different that there is no 
comparison between them. They are analogous to those of 
Horkelia as contrasted with Potentilla, that is, the calyx is 
never expanded, and the petals are elongated and erect, never in 
the least spreading. The genus-has-a remarkable range, occur- 
ring from Labrador all the way across to the Pacific shores, 
and southward as far as Mexico. The species are to be distin- 
guished, just as in most Potentilla groups, by almost no charac- 
ters of flower or fruit, but by good characters of foliage. The 
red color of the calyx is nearly universal, and the mature styles 
are as red underneath the plume; and so I call the genus 
ERYTHROCOMA. 
E. TRIFLORA. Geum triflorum, Pursh. Leaf-segments as- 
cending, cuneiform, 1 to 14 inches long, almost parallel-nerved, 
entire except near the apex, there deeply 3-toothed, or bifid and 
each lobe 3-toothed : calyx-segments triangular-subulate, very 
acute, much surpassed by the narrowly linear bractlets: petals 
spatulate-oblong, obtuse, nearly equalling the bractlets: plume 
of the achenes 2 or 24 inches long. 
Elevated prairies and drift hills of Illinois, Wisconsin, Minn- 
esota, and the Dakotas. 
E. cINERASCENS. Allied to the last, but low, the foliage 
barely half as large, subcinereously appressed-villous; leaf-seg- 
ments not half as large, more broadly cuneate, more deeply 3 to 
5-toothed, less ascending on their rachis: flowers quite as large 
as in the last, the red color of the calyx concealed by a denser 
pubescence: plume of achenes hardly 2 inches long. 
Black Hills about Fort Meade, western S. Dakota, W. H. 
Forwood, 1887 ; good specimens in U. 8. Herb. 
E. AFFINIS. Also allied to Æ. ¢riflora by broad segmentation 
of foliage with segments entire except at summit, of subquad- 
rate-cuneate outline, ł to 1 inch long, deeply 3 to 5-toothed, not 
notably ascending but spreading on their rachis, nearly glabrous 
