196 COMPOSIT-ffi. 



pinnate ; rachis and lobes incisely serrate ; heads numerous, corymbose ; 

 pappus short, equal, 5-toothed. 



Road sides, near fences, &c. Can. and N. S. July, Oct. %.—Stem 2 — 4 

 feet high, rjbbed. somewliat branched above. Leaves 2—6 inches long, dotted. 

 Heads in dense terminal corymbs, deep yellow. The whole plant is bitter and 

 aromatic, and much used as a popular medicine. Introduced and in many 

 places completely naturalized. Common Tansy. 



46. GNAPHALIUM. Unn.—Cxidyfeed. 



(From the Greek yva<pa'Kov, soft dovon or waol, with which the leaves of many 

 species are clothed.) * 



Heads many-flowered, heterogamous ; flowers all tubular ; 

 outer ones in many series, pistillate, very slender ; those of the 

 disk perfect. Involucre ovate, Mth the scales imbricate, ap- 

 pressed and somewhat hyaline. Receptacle flat, naked, Ache- 

 nia somewhat terete, or more or less obcompressed. Pappus 

 in a single series, of filiform roughish bristles. 



* PistUlale flowers in several series. AcJienia somewhat terete. 

 •f Leaves decurrent. 



1. G. decurrens Ives.*: stem erect, simple, viscid-pubescent, branched at 

 the summit ; leaves linear-lanceolate, partly clasping, very acute, decurrent, 

 roughish and green above, white and woolly beneath ; heads nearly sessile, 

 in dense roundish clusters at the summits of the branches. 



Fields and hills. Can. N. Y. Mass, and N. J. Aug., Sept. %.—St€m about 

 2 feet high. Heads subsessile, in large roimdish clusters. Scales of the invo- 

 lucre yellowish-wliite, Decurrent Cud-weed. 



•ff Leaves not decurrent. 



2. G. polycephalum Mich. : stem erect, paniculate above, tomentose ; 

 leaves linear-lanceolate, tapering at base, acute, smoothish above, white- 

 tomentose beneath ; heads obovate, crowded in a corymb at'the summits of 

 the branches. 



Fields. Can. to Louis. W. to Texas. July— Sept. ®. — Stem 1—2 feet high, 

 often much branched at the summit. Heads at length obovate. Scales of the 

 involucre yellowish-white. The whole plant has a balsamic odor. 



Fragrant Life-everlasting. 



3. G. uliginosum Linn. : stem herbaceous, diflfusely branched, woolly ; 

 leaves linear or linear-lanceolate, tomentose on both sides ; heads in dense 

 subglobose terminal clusters, leafy at the base. 



Wet grounds. Can. and N. S. N. to Newfoundland. W. to Oregon and Califor- 

 nia, July — Sept. (1). — Stem 4 — 6 inches high, very much branched. Heads 

 small. Scales of the involucre yellowish-brown, shining. Marsh Cud-weed. 



4. G. purpureum Linn. : stem erect or ascending, woolly ; leaves oblong- 

 spatulate, mostly obtuse, mucronate, tomentose beneath; heads sessile, 

 clustered, axillary and terminal. G. Americanum Willd. 



Barren soils. N. H. to Louis. W. to Texas. July— Oct. %.—Stem &— 12 

 inches high, slender. Heads somewhat spiked at the top of the stem, purplish. 



Purple Cudrweed. 



