372 COMPOSITE tlAILLARDELLA 



ARNICA 



or barely convex. Ray-flowers with irregular and cuneate deeply 

 3-4-cleft fertile ligules : disk corollas with rather short proper 

 tube, elongated and narrow-funnelform throat and 5-toothed limb. 

 Style-branches elongated, hispidulous, and produced beyond the 

 stigmatic lines into acuminate tips. Achenes linear, flattish, stri- 

 ate-nerved. Pappus a single series of rather stout aristiform 

 plumose bristles. 



R. argentea Gray 1. c. Rootstock extensively creeping, somewhat lig- 

 nescent: leaves silvery with silky tomentum, 1-2 inches long: scapes 2-4 

 inches high : head narrow, in depauperate specimens 7-8-flowered, but 

 usually about 15-flowered : rays none. From Crater Lake Oregon to the 

 San Bernardino Mountains in California. 



R. Pringlei Greene Bull. Torr. Club ix, 17. Scapes 12-18 inches high 

 from a branching rootstock or prostrate short leafy branches : leaves al- 

 most linear, some of them remotely serrate-toothed, glabrous, 3-4 inches 

 long: involucre campanulate, about 40-flowered, its numerous bracts but 

 slightly united near the base: flowers orange-yellow, 6-10 of them conspic- 

 uously radiate: pappus-bristles 15-18. Subalpine in the mountains of 

 northern California, to be looked for in southern Oregon. 



+-*• Involucre of several connivent erect herbaceous equal bracts, 

 many-flowered. Ours herbs with the flowers all perfect. 



85 ARNICA L. Gen. n. 958. 



Perennial herbs with erect stems, mostly opposite leaves and 

 comparatively large heads of yellow flowers. Heads many-flower- 

 ed, conspicuously radiate, or the rays rarely wanting Involucre 

 campanulate, of several thin-herbaceous oblong-lanceolate to 

 linear equal bracts in a single or somewhat double series. Recep- 

 tacle flat, sometimes fimbrillate or villous. Corollas of the disk- 

 flowers with a commonly elongated hirsute tube and fun- 

 nelform or cylindraceous 5-lobed limb. Achenes linear, more 

 or less 5-10-costate or angled. Pappus a single series of numer- 

 ous rather rigid capillary bristles, from scabrous to barbellate. 



* Radical leaves mostly cordate at base, on slender sometimes 

 winged petioles : roots tocks slender and creeping. 



■*- Rays wanting, or rarely some rudiments : cauline leaves some- 

 times by disjunction alternate, usually some of them petioled, irregu- 

 larly dentate : heads several, paniculate. 



A. parviflora Gray Proc. Am. Acad, vii, 363. " A foot high, slender, 

 pubescent, even the peduncles but slightly glandular: leaves narrowly 

 deltoid or oblong, truncate or abrupt at base, an inch or two long : involu- 

 cre 4 or 5 lines high, about 20-flowered; its linear bracts sparsely pubes- 

 cent : achenes not pubescent, minutely glandular." From Crater Lake 

 Oregon to Humboldt Co. California 



A. discoidea Benth. PI. Hartw. 319. More or less villous and viscid: 

 stems 10-18 inches high, rather stout : radical and lower cauline leaves 

 from ovate with truncate or abruptly cuneate base to cordate, not rarely 

 wing-petioled 2-4 inches long : involucre 6 lines high, 30-50-flowered, usu- 

 ally very villous and glandular; its bracts lanceolate to linear : corollas all 

 tubular: achenes pubescent. Wooded hills in the Coast ranges, Washing- 

 ton to California. 



