384 



COMPOSITAE. 



row of deciduous equal white barbed bristles, but ruone in the 

 ray-flowers. 



Crocidium multicaule Hook. Woolly when young but soon glabrate; 

 stems numerous, tufted, 5-25 cm. high; radical leaves in a basal tuft, obovate 

 or spatulate, few-toothed, sessile or short-petioled; cauline leaves small, 

 linear; heads slcndcr-pcduncled, small but showy; tegules oblong-ovate. 



In open ground, Vancouver Island to California. First found at Fort 

 Vancouver, Washington, by Douglas. 



538. ARNICA. 



Perennial herbs; stems mostly simple, from creeping rootstocks 

 or a corm-like base; leaves all or some of them opposite, simple, 

 entire, or merely toothed; heads rather large, solitary or few, 

 usually long-peduncled, many-flowered; flowers yellow, all fertile; 

 ray-flowers elongated, pistillate, or sometimes none; involucre 

 broadly campanulate, the tegules in 1-2 rows; receptacle naked, 

 flat; pappus a single series of rather rigid strongly scabrous or 

 barbellate capillary bristles; akenes linear, 5-angled or 5-10- 

 ribbed, somewhat hirsute or nearly glabrous. 



The species of this genus are of very unsatisfactory definition. 



Basal leaves cordate, long-petioled. 



Herbage pubescent, the stems hirsute or villous. 

 Herbage glabrous. 



Akenes atomiferous-glandular; leaves often simi- 

 larly glandular on both sides. 

 Akenes glabrous or nearly so. 



Leaves large, usually dentate, thin. 

 Leaves small, crenate-dentate, firm. 

 Basal leaves not cordate, short-petioled. 

 Heads rayless. 

 Heads radiate. 



Pappus whitish, barbellate. 



Herbage viscid-glandular; upper leaves much re- 

 duced. 

 Herbage atomiferous-glandular or glandless; 

 upper leaves but little reduced. 

 Pappus fuscous, subplumose. 



Upper surface of leaves glabrous, sticky. 

 Stem leaves ovate or ovate-oblong. 

 Stem leaves lanceolate or lance-oblong. 

 Upper surface of leaves pubescent. 

 Pubescence sparse, pilose. 

 Pubescence dense, short. 



A. cordifolia. 



A. gracilis. 



A. 

 A. 



latifolia. 

 hetonicaejolia. 



A. eradiata. 



A. 



A. 

 A. 



A. 



A. 



ftdgens. 

 aurantiaca. 



amplexicatdis. 

 macounii. 



aspera. 

 mollis. 



Arnica cordifolia Hook. Erect from horizontal rootstocks, 20-40 cm. high, 

 sparsely pubescent; basal leaves ovate or orbicular, deeply cordate, dentate, 

 acute or obtuse, 5-10 cm. long, on petioles about as long; cauline usually 2 

 pairs, less broad, the short petioles margined; heads long-pcduncled; involucres 

 turbinate-campanulate, 15-20 mm. high, viscid-pubescent, the linear-lanceolate 

 tegules acute; ray-flowers 8-12, yellow, 2-3 cm. long; akenes pubescent. 



In the mountains' at low altitudes, rare in our limits, but common east of 

 the Cascade Mountains; upper Nisqually Valley, Allen. 



