ORDER 70. COMPOSITE. 163 



pressed-ae.-rate ; scales 2-rowed, long, revolute; heads large, showy, with 3060 nar- 

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



/3. cimineu*. 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.) 



. firmus. Low (2 3f), scabrous, stout; leaves thick, subentire ; heads many. 



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



27 A. preiiantlioides Muhl. Hairy or downy, corymbous-paniculate ; Ivs. lanco- 

 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. coiiciunus 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. mutiibilis 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. carneiis 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. vlrgatus Ell. Smooth, virgate branches racemed; leaves linear-lanceolate, 

 ciliate-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 subcorymbcd ; 

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



ft. ItetWoru*, Branches slender, corymbed at end ; Ivs. very narrow. W. Showy. 



34 A. longifolius 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 (if. Blue. 



/3. prcedltw Tall, strict, with thyrsoid panicles, medium heads : Ivs. serrulate. 



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

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



36 A. olilongifoliiis N. Hairy, bushy ; branches spreading ; leaves r/bl. -lanceolate, 

 ucute, entire, clasping, graded above into subulate bracts and sv)uiaal spreading 

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



^7 A. gran diflor us L. Rough, bristly-hairy ; branches some cor/rjred, 1-flowered ; 

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



>8 A. Curtisli T. & G. Smooth, racemous; Ivs thin, sessile, lanceolate, acuminate, 

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



.{9 A. dumosiis L. Rac. paniculate ; Ivs. linear to oblong, sessile, fowest 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' 3". 

 /3. corittifoliuS) is a starved, attenuate form, very slender every way. 



10 A. Tradescaiiti L. Smoothish, slender, much branched ; Ivs. lance-linear. Ion;,', 

 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". 

 /3. frds~1llf. Leaves nearly linear, minutely serrulate ; heads scattered. 



41 A. miser L. Hairy or downy, very leafy : branches spreading, rac^mous ; Ivs. ah 

 lanceolate, tapering both ways, sessile, sharply serrate in the mic'i'J.e. the ramml 

 smaller, entire: scales acute, close: rays whitish, short. Old fields. rA -80'. Variev 

 greatly. LVB. 5' 1', broai or narrow. lids, dense or scattered. Ray* IE + , 2 3'-'. 



