212 COMPOSITE. 



1. C. Nardosmia, Gray. Eobust, 1 ft. high or more: leaves mostly 

 radical or at the base of the stem: heads 1 in. high, peduncled, corym- 

 bosely or raoemosely arranged near and at the summit of the stem: 

 flowers honey-yellow, sweet-scented. — Mountain summits of northern 

 Napa, or adjacent Sonoma Co., collected by the author, in 1874; other- 

 wise a far northern plant. June. 



66. 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. Kecep- 

 tacle 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. 



1. A. discoidea, Benth. Stontish, 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. 



67. SENECIO, Malthiolus. Plants extremely diverse in habit, fol- 

 iage, etc., but leaves always alternate. Heads clustered cymosely, or 

 solitary; either radiate or discoid. Involucre usually cylindrical, of 

 many equal bracts, and with calyx-like bracteoles at the base. Flowers 

 yellow; those of the disk 5-toothed or -lobed. Beceptacle flat or convex. 

 Achenes commonly glabrous, terete, or somewhat ribbed. Pappus of 

 very copious fine white capillary merely scabrous bristles. 



* Annual species. 



1. S. vulgaris, Tragus (1552). Nearly glabrous, •slightly fleshy, 1 ft. 

 high more or less, branching, leafy throughout: leaves clasping at base, 

 pianalifid; the lobes and sinuses sharply toothed: scales at base of the 

 small cylindric involucre with black tips: rays none. — Abundant in rich 

 shady cultivated grounds; flowering at all seasons of the year. 



2. S. aphanactis, Greene. Slender, 2—6 in. high, slightly arachnoid 

 when young, glabrate in age, scarcely viscid, scentless: leaves % — % in. 

 long, slightly fleshy, erect or ascending, the lowest linear-spatulale, the 

 caulirte linear to oblong, coarsely toothed or slightly lobed: heads very 

 small, 2 or 3 together at the ends of the few branches: bracts of involucre 

 linear-acuminate, not black-tipped :rays about 5, minute, recurred: achenes 

 appressed-silky. — Clayey slopes, or open hilltops of the Mt. Diablo Eange. 

 A somewhat rare indigenous plant, strangely mistaken, by some, for the 

 Old World weed S. silvaticus. March, April. 



