174 LEAFLETS. 
HESPERODORIA Haru. Aplopappus Hallii, Gray. That this 
has rays while the type is rayless does not with me count for 
much ; but the involucres are not quite the same, neither is the 
pappus, nor even the style-tips. 
Segregates from Sieversia 
Never well content with North American Sieversia as set forth 
by myself seven years ago (Pitt. iv 78), I here present another 
and to my mind a more statisfasctory view of that heterogene- 
ous assemblage. Steversia was founded on a Siberian under- 
shrub low and slender, with almost rotate calyx and corolla, the 
former nearly chorisepalous, and its mature styles are long, 
filiform, plumose to the very apex. We have nothing in North 
America that I can regard as congeneric with it; and our most 
familiar kindred types are far enough from that in habit and 
respective generic characters, and as far from each other. 
Our subarctic and subalpine, or even alpine herbs with yellow 
flowers, of peculiar habit and turbinate calyx-tube are distinct 
by two important characters of the style, which is neither 
plumose, nor even accrescent after flowering. They are hardly 
longer than the stamens; and the whole group is so much like 
Potentilla that two of the four members of the genus already 
described were at first published as of that genus. There are 
few if any better genera of Potentillee than this; and I name 
it ACOMASTYLIS. 
A. Rossi. Seringe in D.C. Prodr. ii. under Geum. 
A, TURBINATA. Rydb.in Torr. Bull. xxiv. “ = 
A. SERICEA. Greene, Pitt. iii. ei 8 
A. GRACILIPES. Piper., Torr. Bull. xxvii “ Potentilla. 
A. DEPRESSA. Caudex very long and stout: leaves very short, 
rosulate-depressed, softly appressed-silky but not canescently 80: 
scapiform peduncles only 2 or 3 inches high, 1-flowered : calyx 
tube very short, scarcely turbinate, the segments twice or thrice 
as long, the whole very villous. 
Mount Stuart, Washington, Aug. 1898, A. D. E. Elmer, n- 
1182, as in U. S. Herb. 
