ORDER 70. COMPOSITE. 163 



pres?ed-se:rate ; scales 2-rowed, long, revolute ; heads large, showy, with 3060 nar- 

 row, pale-purple rays Swamps, Can. to Car., and W. 4 6f. Stem often red. 



/3. t inttufiiH. Tall, slender, smoothish ; heads few, very large ; leaves narrow. 



y. g-laber. Low (2f ), subsimple, smoothish ; leaves narrow, erect, entire ; scales 

 loose, not recurved ; rays large, about 20, white ? 111. (J. Wolf.) 



6. firmu*. Low (2 3f ), scabrous, stout ; leaves thick, subcntire ; heads many. 



. randtdus the common form, with white rays. N. Y. (Hankenson.) 



27 A. preiiaiitlioides Muhl. Hairy or downy, corymbous-paniculate ; Ivs. lance- 

 oval, pointed, serrate, the long petiole winged and auriculatc-clasping : scales spatu- 

 late, the green tips spreading. Wet banks, N. Y. to Va., and W. 2 3f. 



28 A. coiicinuus Willd. Pubescent, subsimple; Ivs. lanceolate and lance-linear, 

 remotely serrate, narrowed to the clasping base, the upper entire ; scales appressed- 

 imbricate ; heads medium, rays blue. Woods, &c. 2 3f. 



29 A. gracilleiitus T. & G. Very smooth, slender, simply panicled: leaves long- 

 linear, the lower toothed, upper clasping, erect ; scales short ; rays blue. S. Rare. 



30 A. iiiiitabilis Ait. ? Stem smooth, paniculate-branched from base, dense-flwd. ; 

 leaves linear-lanceolate, serrulate, clasping, thickish, upper lance-oblong, entire ; 

 heads medium ; scales lanceolate, loose, much shorter than the disk ; rays pale ? Wet. 

 111. (J. Wolf.) 2 3f. Varies with leaves serrate, heads loose, &c. 



31 A. carneus Nees. Smoothish ; branches leafy, ascending, racemed with 1-headed 

 branchlets ; Ivs. uniform, linear-lanceolate, pointed, only the upper clasping ; scales 

 acute, shorter than the disk. Moist, E. and W. Heads larger than in No. 30, purple 

 to rose, showy. Stem often red, 2 3f high. 



32 A. virgatu* Ell. Smooth, virgate branches racemed; leaves linear-lanceolate, 

 ciliatc-serrulate, half-clasping, graded above into numerous subulate bracts and 

 spreading, pointed scales ; fruit glabrous. Ga. to La. 3 4f. 



33 A. Novi-Belgll L. St. smoothish, branches pubescent; Ivs. subclasping, lance- 

 obi, to linear, pointed, the lower subserrate ; heads large, racemed or subcorymbed ; 

 scales subequal, loose, equalling the disk. N. Y. to 111. 2-4f. Blue. (A. aestivus Ait.) 



/3. ItKtfftbru*. Branches slender, corymbed at end ; Ivs. very narrow. W. Showy. 



34 A. loiigifollus Lam. Stem glabrous, paniculate-spreading; Ivs. lance-linear to 

 linear, long, pointed, subclasping, nearly or quite entire, upper subulate ; heads large ; 

 scales linear-subulate, the outer spreading. E. and W. 2 Gf. Blue. 



ft. frxcUtue. Tall, strict, with thyrsoid panicles, medium heads : Ivs. serrulate. 



35 A. Elliotlii T. & G. Stout, smooth, corymbous-branched ; Ivs. ample, lanceolate, 

 subclasping, subserrate ; ped. naked ; scales attenuate. Swamps, S. 2 4f. 'Purple. 



36 A. ofolongifolius N. Hairy, bushy ; branches spreading ; leaves obi. -lanceolate, 

 acute, entire, clasping, graded above into subulate bracts and subequal spreading 

 scales. Va. (Harper's Ferry) to Iowa and Mo. Rays purple. 1 2f. 



S7 A. graiidiflorus L. Rough, bristly-hairy ; branches some corymbed, 1-flowered ; 

 Ivs. small, linear-oblong, obtuse ; hds. very large, blue-purple ; scales obtuse. S. 2f. 



JS A. Curtisii T. & G. Smooth, racemons; Ivs. thin, sessile, lanceolate, acuminate, 

 subcntire : scales with green spreading tips ; heads large, showy. Mts. N. Car. 



.19 A. <1 uiao*ii* L. Rac. paniculate ; Ivs. linear to oblong, sessile, lowest subserrate ; 

 invol. obtuse at base, closely imbricated ; scales obtuse; heads small, rays 20 + , pur- 

 plish-white. Dry woods, &c. : common. 1 2f. Lvs. very numerous, 3' y. 

 ft. coritHfbliuS) is a starved, attenuate form, very slender every way. 



1 A. Tradescanti L. Smoothish. slender, much branched ; Ivs. lance-linear, long, 

 remotely serrulate, teeth sharp, upper leaves entire, all sessile ; heads many, subse- 

 cund ; scales close ; rays small, pale. Fields, copses. 2 4f. Leaves 5' 5". 

 ft. frag-ilt* t Leaves nearly linear, minutely serrulate ; heads scattered. 



41 A. miser L. Hairy or downy, very leafy ; branches spreading, racemous ; Ivs. ah 

 lanceolate, tapering both ways, sessile, sharply serrate in the middle, the ramial 

 smaller, entire : scales acute, close : rays whitish, short. Old fields. 6' 30'. Varies 

 ereatly. Lvs. 5' 1', broai or narrow. lids, dense or scattered. Rays 15 + , 2 3". 



