372 ‘COMPOSIT A RAILLARDELLA 
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 l.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: 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 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. Pl. 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. 
