176 COMPOSITE. (COMPOSITE FAMILY.) 



§ 1. Bristles of the male pappus hardli/ at all thickened but minutely harbellatf 

 near the apex: akenes puberulent : bracts of the involucre brownish. 

 1. A. dimorpha, Ton. & 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 f 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, ivith thickish and clavate or scarious- 



dilated tips. 

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

 dex, leafj, naked at summit, and bearing a cluster of broad heads : inner 

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

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

 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 

 lauceolate-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. 

 — n. ii. 430. From Wyoming to Oregon and British Columbia. 



3. A. Carpathiea, R- Br. Floccosely ivhite-ivoolly, rather stout : lower 

 leaves spatulate-lauceolate 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. 

 H- Heads in a cymose cluster, sometimes solitary : involucre icoolly at base. 



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

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

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

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

 wholly livid and scarious and from acutish to acuminate : akenes glandular. — 

 High mountains of Colorado and California, and far northward. 



o. A. dioiea, Gsertn. Freely surculose and forming broad mats : floAvering 

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

 leaves from obovate to spatulate, hali-mch to nearly an inch long, rarely glab rate 

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



