328 COMPOSITE ANTKNNARIA 



spatulate or oblanceolate, 3-12 lines long, mostly acute : heads numerous, 

 3-4 lines high, cylindraceous, or the staminate campanulate, in terminal 

 spicately or cymosely disposed glomerules: involucre very woolly at base; 

 of the pistillate heads commonly 4 lines long, of the staminate shorter, the 

 inner in both with conspicuous rose-purple or ivory- white tips which in 

 the latter are obtuse, in the former narrower and acute. In dry open 

 woods, eastern Washington to California, not common. 



* * Not surculose-stoloniferous : stems simple from the subterranean 

 branching caudex, rather strict, leafy, naked at the summit, and 

 bearing a mostly cymose-compound cluster of heads : inner bracts of 

 the staminate involucre all wi<h conspicuous ivory-white obtuse tips; 

 those of the pistillate hwit hardly any tips: herbage silvery-lanate: 

 larger lower leaves 3-nerved. 



A. luzuloides T. & G. Fl. ii, 430. "Closely silky-woolly : stems slender 

 8-12 inches high : leaves all narrowly linear or some of the lowest narrowly 

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

 lines or the pistillate barely 3 lines long), several or numerous: involucre 

 glabrous nearly or quite to the base ; it* inner bracts in the pistillate heads 

 obtuse: achenes glandular; the spatulate and as it werepetaloid tips of the 

 staminate pappus obtuse." Brit. Columbia to Oregon and Wyoming, east 

 of the Cascade mountains. 



A. argentea Benth. PI. Hartw. 319. Silvery lanate with a very fine 

 and somewhat strigose pubescence: stems slender, 10-20 inches high, 

 leafy, leaves linear-lanceolate or broader to linear, 1- 4 inches long, atten- 

 uate below to a margined petiole with a dilated and somewhat clasping 

 base, more or less prominently 3-nerved: heads small numerous, panicl- 

 ed: involucre glabrous, 1-2 lines high, its bracts obtuse or acutish : tips of 

 the staniinate pappus dilated. Dry grounds, Washington to California. 



A. lanata Greene Pitt, iii 288. A. Carpathica R. Br. as to the Ameri- 

 can plant. Densely white-woolly: stems simple, 8-12 inches high: lower 

 leaves spatulate-lanceolate, 1-3 inches long, attenuate below to a slender 

 petiole, the upper linear, with conspicuous scarious tips : heads several to 

 many, in a close capitate terminal cluster: involucre 2-3 lines high, dense- 

 ly woolly at base, the inner bracts with conspicuous white tips; of the sta- 

 minate flowers broad and obtuse, of the pistillate linear and acute : achenes 

 glabrous: pappus of the staminate flower of moderately dilated bristles. 

 On high mountains, Brit. Columbia to eastern Oregon. 



* * * Surculose-proliferous by either subterranean or humifuse and 

 leafy shoots or stolons. 



-*- Involucre woolly at base. 



A. media Greene 1. c. 286. A. alpina of authors as to the American 

 plant. Somewhat cespitose: radical shoots not very numerous, short: 

 densely silky- woolly: flowering stems 1-6 inches high: radical leaves broad- 

 ly spatulate to obovate, 4-10 lines long; cauline linear-spatulate to linear: 

 heads few to several; the pistillate sessile in a close capitate cluster, with 

 brown narrow lanceolate acute involucral bracts ; the staminate heads oft- 

 en somewhat panicled, with oblong mostly obtuse bracts with scarious 

 white tips: pappus but little if at all thickened upward. On the highest 

 mountains, Brit. Columbia to California and the Rocky Mountains. 



A. rosea Greene 1. c. 281 ; A. dioica var. rosea Eaton. Loosely surculose : 

 silvery-canescent and floccose: stems stoutish, 2-12 inches high, leafy: 

 leaves of the sterile shoots oblanceolate to spatulate, an inch or more 

 long ; of the flowering stems linear-lanceolate to linear, !-!) inches long : 

 heads usually numerous, in a close panicle : bracts of the involucre rose- 

 color to red., about 2 lines long, lanceolate, mostly obtuse : staminate plant 

 not seen. On the highest mountains, from Brit. Columbia to California. 





