woRYMBIFERE.E. 169 



Genus XYL PTEROCAULON. (Syn ConyzaJ 



Involucre imbricate, loallets somewhat obovate, acute, ap- 

 pressed, tomentose. Flowers pistillate and perfect, intermin- 

 gled, the pistillate ones slender, with the border 3-toothed ; the 

 pertcct ones with the bonier .j-clet't. Anthers very short. 

 Stijie 2-ciet't. Stigmas glandular. 



1. P. Pycxostachyum. Stem erect, simple, ringed, densely tomentose, 

 white. Leaves lanceolate, sessile, decurrcnt, dentate, white, tomentose be- 

 neath. Ftotptrs in compact spikes. Involucre densely tomentose. Seed*- 

 angled, pubescent, receptacle naked. 



White. 1\.. May — August. Dry, sandy soils. 1-2 feet. 



GE.NCS X\1I. GNAPHALIUM. 



Involucre imbricate, with scales oblong, membranaceous, us- 

 ually colored. Pistillate and perfect florets intermingled. — 

 Pistillate florets slender, 5-toolhed. Stamens none. Perfect 

 florets., stamens as long as the corolla. Seeds glabrous, pap- 

 pus pilose. Receptacle naked. 



1. G. PoLYCEraiLUM. Stem erect, branching towards the sunimi". ^^!l::e, 

 tomentose. Laives sessile, hncar-lanceulatc slightly undulate, ^laiaous 

 above, tomentose and white beneath. Flowers in termmai corymbs; involu- 

 cre conical, leatlets oblong, tomentose at the base. Seeds cylindrical glabrous 

 pappus, piJose. 



White. Q. September^October. Very common. 1-2 feet. 



2. G- PTTtFTKtTM. S'^-m erect or decumbent, simple, tomentose- Leaven 

 \\\v V mucronate, undulate. Flowers 

 in- 1 the leadets ovate, glabrous, mncr 

 ones tinged with purple, ^ed oblong, scabrous. 



Purple. % March— May. Common. 1-12 inches. 



Gextts XVm. ANTENNARIA. cSyn. Gnaphalium.) 



Involucre many leaved, imbricate ; scales oblong, scarious, 

 colored. Flowers dia?cious. Seeds glabrous. Pappus plu- 

 mose. Receptacle naked, 



1. A. !\Iargaritv rr-M. Stem erect, branching near the summit. Leaves 

 hnear-lanceolatc, t . acute, tomentose beneath, entire. jFZoitersin fas- 

 tigiate cor>-mbs. 7,...-... ,. many leaved, with ovate, obtuse, white scales. 



Yellow. %, August — Sept. Mountains. 1-2 feet. 



2. A. Pr • ^ V, with procumbent shoots, white, to- 

 menlose. - ae, entire, nerved, tomentose beneath ,• 

 cauline one?* spatuiate, lanccoiate. FUncers in small, terminal cor)'nibs. In- 

 rfJucrc wnih tlie inner scales long, obtuse, colored. 



Reddish white. %■. May— June. Carolina, Georgia. 



GE.XUS XLX. CONYZA. 



Calyx imbricate, scales sub-linear, somewhat scarious, ap- 

 pressed, receptacle naked. Flowers pistillate and perfect ; 

 the exterior ones fertile, 5-cleft ; pappus simple, plumose. — 

 Seeds hairy. 



TABT II. 13 



