198 COMPOSITE. 



1 2 feet high, clothed with a thick wool. Heads numerous, rather large, pedi- 

 cellate, in a spreading corymb. Involucre pearly white. Flowers yellowish. 



Pearly Everlasting. 



49. ERECHTITES. Raf. Fire Weed. 



(An ancient name of a species of Senecio, from which this genus was sep- 

 arated.) 



Heads many-flowered, heterogamous ; marginal flowers pis- 

 tillate, somewhat 3 5-toothed ; the central ones perfect, 4 5- 

 toothed. Involucre cylindric, in one series ; the scales linear, 

 acute. Receptacle naked, somewhat papillose. Achenia ob- 

 long, striate. Pappus in many series, of very fine somewhat 

 roughish hairs. 



E. hieradfolia Raf. : stem striate, simple or paniculate above ; leaves 

 oblong-lanceolate, sessile, attenuate at base, coarsely and unequally ser- 

 rate; upper auriculate at base and partly clasping; involucre cylindric, 

 with linear-subulate bracteoles at the base. Senecio hieracifoliiis Linn. 



Road sides and burnt grounds. Can. and throughout the II. S. July, Aug. 

 (I). Stem 2 5 feet high, stout, succulent, more or less hairy. Heads numerous, 

 middle-sized, in a compound terminal panicle ; rays none ; disk flowers numer- 

 ous, white or yellowish. Common Fire-weed. 



50. ARNICA. Linn. Arnica. 

 (Said to be a corruption of Ptarmica.) 



Heads many-flowered, radiate ; ray flowers pistillate ; those 

 of the disk tubular, perfect. Involucre campanulate ; the scales 

 in two series, linear-lanceolate, equal. Receptacle flat, some- 

 what hairy. Achenia tapering at each end, somewhat hairy. 

 Pappus in one series of rough rigid bristles. 



1. A. nudicaulis Nutl.: hirsute; leaves sessile; the radical clustered, 

 elliptic-ovate, nerved, entire or slightly toothed ; cauline 1 2 pairs, lance- 

 ovate ; heads terminal, on loosely corymbose peduncles. A. Claytoni Pursh. 

 Doronicum nudicaule Mich. 



Meadows. Chester county, Perm. Darlington ; rare. S. to Flor. July, 

 Aug. 1|-. "Stem 1 2 feet high, with a few peduncle-like branches at the sum- 

 mit, somewhat viscid. Heads large ; rays numerous, deep yellow, 2 3-toothed 

 at the apex ; disk greenish-yellow. Naked-stemmed Arnica. Leopard 's-bane. 



2. A. mollis Hook. : villous-pubescent ; stem leafy, bearing 1 5 heads ; 

 leaves lanceolate or oblong, smoothish when old, repand-denticulate ; upper 

 ones closely sessile ; the lower narrowed at base or tapering into a petiole ; 

 scales of the involucre acuminate, hairy. 



Borders of rivulets, in the mountains of Essex county, N. Y. Aug. Ton- 

 White Mountains, N. H. 1\.. Root creeping. Stem 1220 inches high, simple 

 more or less pubescent. Heads about 3, large ; rays 2 3-toothed at the summit 

 pale yellow. Pappus nearly plumose. Ptibescent Arnica. 



