372 COMPOSITAE RAILLARDELLA 



ARNICA 



united into a cup to or above the middle. Receptacle naked, flat 

 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 catnpanulate, 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 zvith 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-flow- 

 ered, conspicuously radiate, or the rays rarely wanting. Invo- 

 lucre 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 funnelform 

 or cylindraceous 5-lobed limb. Achenes linear, more or less 5-10- 

 costate or angled. Pappus a single series of numerous rather 

 rigid capillary bristles, from scabrous to barbellate. 



* Radical leaves mostly cordate at base, on slender sometimes 

 winged petioles : rootstocks 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 ,it 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, SO-SOrflowered, usu- 

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



