462 coMPOSiT^E. 



leaves, and one or more peduneled heads of yellow sliowy flowers; the 

 plant with wholly the aspect of an Arnica, from which genus it is hardly 

 well distinguished by its more firm and persistent ray-corollas, and its 

 want of a pappus. Involucre campanulate, of 9 — 12 thin-herbaceous 

 lanceolate-oblong or ovate lanceolate equal bracts, these partly biserial. 

 Receptacle conical, villous. Rays 10 — 16, becoming somewhat papery 

 and persistent; their achenes somewhat obcompressed, several-nerved. 

 Disk-achenes infertile. Pappus none. 



1. W. (lealbata, Gray, Proc. Am. Acad. vi. 549 (1865). Stems 1 ft. 

 high; herbage hoary with a fine close tomentulose pubescence: lowest 

 leaves obovate or spatulate, entire or denticulate; the cauline reduced, 

 opposite, few: rays 1 in. long. — From Mariposa Co. northward, at middle 

 elevations of the Sierra. 



104. ARNICA, Ruppius. Perennial herbs, somewhat glandular or 

 viscid and aromatic. Leaves opposite. Heads one or several and large, 

 at summit of the stem. Involucre broadly campanulate, not bracteolate 

 at base ; the herbaceous bracts lanceolate, equal, in about 2 series. Re- 

 ceptacle flat, naked. Disk-corollas yellow (as also the rays when 

 present), with distinct long tube and funnelform or cylindraceous 

 5-lobed limb. Achenes linear, angled. Pappus a single series of rather 

 rigid brownish scabrous or barbellate bristles. 



* Heads desiitute of rays. 



1. A. discoidea, Benth. PI. Hartw. 319 (1849). Stoutish, very hairy, 

 2 ft. high or less: leaves ovate or oblong, 2 — 4 in. long, coarsely toothed, 

 cordate, or truncate, or sometimes slightly cuneate at base; the upper 

 smaller, sessile, often alternate: heads % in. high, rayless: involucre 

 villous and glandular: achenes sparsely pubescent, not glandular. — 

 Northward slopes of the higher coast mountains, in shady places chiefly. 

 June, July. 



2. A, parviflora, Gray, Proc. Am. Acad. vii. 363 (1867). Slender, 

 pubescent, 1 ft. high or more, only slightly glandular: lowest leaves 

 long-petioled and small, the blade narrowly deltoid or oblong, truncate 

 or abrupt at base, 1 — 2 in. long: involucre 4 — 5 lines high, its linear 

 bracts sparsely pubescent; rays none: achenes minutely glandular, not 

 pubescent. — Humboldt Co., in thickets. Bolartder. 



3. A. viscosa, Gray, Proc. Am. Acad. xiii. 374 (1878). Raillardella 

 paniculata, Greene, Eryth. iii. 48 (1895). Very viscid and pubescent, 

 1—2 ft. high, fastigiately branched above and paniculate, the monoceph- 



