174 LBAFLHTS. 



Hbsperodoria Hallii. 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. Sieversia 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 hai'dly 

 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 Potentilleae than this ; and I name 



it AOOMASTTLIS. 



A. Rossii. Seringe in D.C. Prodr. ii. under Geum. 



A. TUBBiNATA. Eydb. in Torr. Bull. xxiv. " " 



A. SEEiCBA. Greene, Pitt. iii. " " 



A. GBACILIPES. Piper., Torr. Bull, xxvii " Potentilla. 

 . A. DEPBES8A. Caudex very long and stout : leaves very short, 

 rosulate-depressed, softly appressed-silky but not canescently so: 

 Bcapiform peduncles only 3 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. 



