176 COMPOSITE. (COMPOSITE FAMILY.) 



1. Bristles of the male pappus hardly at all thickened but minutely barbellate 



near the apex: akenes pul>erulent : bracts of the involucre brownish. 

 1. A. dimorpha, Torr. & Gray. Depressed, cespitose from a stout mul- 

 ticipital caudex, bearing rosulate clusters of spatulate leaves : heads solitary 

 and subsessile at the crown, or raised on a sparsely-leaved stem of an inch or 

 less in height: male head 4 lines high, with broad and obtuse involucral 

 bracts ; female becoming i to inch long, the inner bracts narrow and long- 

 attenuate into a hyaline acuminate tip : pappus of the fertile flowers of long 

 and fine smooth bristles. Fl. ii. 431. Dry hills, from Wyoming to California 

 and British Columbia. 



2. Bristles of the male pappus stouter, with thickish and clavate or scarious- 



dilated tips. 



* Not surculose-stolomferous : stems simple from the subterranean branching cau- 

 dex, leaf t/, naked at summit, and bearing a cluster of broad heads : inner 

 bracts of the male involucre all with conspicuous ivory-white papery obtuse tips ; 

 those of the female with hardly any tips and more scarious : herbage silver y- 

 lanate. 



2 A. luzuloides, Torr. & Gray. Closely silky-woolly : stems slender, a 

 span to a foot high ; leaves all narrowly linear, or some of the lowest narrowly 

 lanceolate-spatulate, small uppermost linear-subulate : heads small (2 lines, or 

 the female barely 3 lines long), several or numerous : involucre glabrous nearly 

 or quite to the base ; the inner bracts in the female heads obtuse : akenes gland- 

 ular : the spatulate and as it were petaloid tips of the male pappus obtuse. 

 Fl. ii. 430. From Wyoming to Oregon and British Columbia. 



3. A. Carpathica, R. Br. Floccosely white-ivoolly, rather stout : lower 

 leaves spatulate-lanceolate and the upper linear : heads broad, 3 or 4 lines long : 

 involucre conspicuously woolly at base, more or less livid, except the white tips: 

 to the bracts of the male ; the inner bracts of the female commonly acutish 

 and thin-scarious : akenes smooth and glabrous. In the Northern Rocky 

 Mountains, and extending south to Oregon ; represented in the lower Rocky 

 Mountains as far south as New Mexico, by the 



Var. pulcherrima, Hook. Stems 6 to 18 inches high: leaves mostly 

 larger, the radical often half an inch or even almost an inch wide : heads more 

 numerous, often in a compound cyme : bristles of the male pappus with more 

 strongly and abruptly or even scariously dilated tips. 



# * Surculose-proliferous by either subterranean or leafy shoots or stolons. 

 i- Heads in a ci/mose cluster, sometimes solitary : involucre woolly at base. 



4. A. alpina, Gaertn. Somewhat cespitose : radical, shoots few and short : 

 flowering stems 1 to 4 inches high, bearing 2 to 5 heads, sometimes a single 

 head : radical leaves spatulate, inch long : involucre 3 lines high, livid-broicn- 

 ish; the inner of the male heads with whitish oblong tips, of the female 

 tvholly livid and scarious and from acutish to acuminate : akenes glandular. 

 High mountains of Colorado and California, and far northward. 



5. A. dioica, Gsertn. Freely surculose and forming broad mats : flowering 

 stems 2 to 8 or even 12 inches high, bearing few or numerous heads : radical 

 leaves from obovate to spatulate, half -inch to nearly an inch long, rarely glabrate 

 above : bracts of the involucre in both sexes with colored (white or rose-colored) 



