426 COMPOSITE. Gnaphalium. 



CONSPECTUS OF THE GENERA. 



♦ Receptacle not chaffy. 



158. Gnaphalidm. Heads heterogamous ; the central flowers perfect, the marginal 



filiform. Pappus all capillary. 



159. Antennaria. Heads dioecious. Pappus of the sterile flowers clavate or 



thickened at the apex. 



♦ * Receptacle chaffy, except in the centre. 



160. Filago. Heads heterogamous ; the exterior flowers pistillate, filiform, sub- 



tended by the chaff of the receptacle (which is similar to the scales of 

 the involucre), destitute of pappus; the central furnished with 

 pappus. 



158. GNAPHALIUM. Linn. (excl. spec.) ; Don, in trans. Wem. soc. 

 5. p. 263 ; Endl. gen. p. 447. 



Heads many-flowered, heterogamous ; the flowers all tubular ; the exte- 

 rior pistillate, very slender, mostly in several series ; the central perfect. 

 Scales of the involucre imbricated, appressed, scarious or somewhat hyaline. 

 Receptacle flat, naked. Style 2-cleft. Achenia somewhat terete, or more 

 or less obcompressed. Pappus a single series of setiform or capillary sca- 

 brous bristles. — Herbs, or rarely suffruticose plants, mostly woolly or tomen- 

 tose ; with sessile or decurrent leaves, and glomerate, corymbose, or spicate 

 heads. Scales of the involucre variously colored. 



§ 1. Pistillate flowers in several series, frequently more numerous than the per- 

 fect: achenia somewhat terete. — Eugnaphalium, DC. 



* Leaves decurrent : scaki of the involucre not yellow. 



1. G. decurrens (Ives): stem stout, branched at the summit, clothed with 

 a viscid pubescence; leaves linear-lanceolate, partly clasping, decurrent, 

 mucronate-acute, granular-viscid and slightly scabrous above, the lower 

 surface like the branches densely whitish-tomentose ; heads subsessile, 

 in dense corymbose clusters, on short leafy and very woolly branches; 

 the scales of the yellowish-white scarious involucre oval, rather acute ; 

 achenia minutely scabrous. — Ives ! in Sill. jour. 1. p. 380, t. 1 ; Torr. ! 

 compend. p. 288 ; Beck ! bot. p. 178 ; Hook.fl. Bor.-Am. 1. p. 328 ; DC! 

 prodr. 6. p. 226. 



Hills and fields, Canada and Northern States, from Massachusetts! and 

 Vermont ! to New Jersey ! — Aug.-Sept. — 2i Stem about 2 feet high. 



2. G. Californicum (DC.) : stem herbaceous, erect, arachnoid-tomentose, 

 somewhat glandular below ; leaves linear-lanceolate, acuminate, somewhat 

 decurrent, glandular-puberulent and viscid both sides (the lower surface often 

 clothed with a deciduous wool) ; heads in dense clusters; scales of the silvery- 

 white scarious involucre oval or oblong, mostly obtuse. — DC. ! I. c. p. 224 ; 

 Nutt.! in trans. Amer. phil. soc. {n. ser.) 7. p. 403. G. decurrens. Less, 

 in Linncea, 6. p. 525 ; Hook. 8^ Arn. hot. Beechey, p. 151, Sf suppl. p. 359 ; 

 not of Ives. 



/3. ? scales of the involucre pale purple. — G. Sprengelii /3. erubescens, 

 Nutt. I. c. 



