COMPOSITE. (COMl'OSITK FAMILY.) 2.j7 



sharpli/ serrate in the middle, vera rowih both sides and riif/ose-veined, closely 

 sessile (2-3' long), nearly equal; scales of the hell-shnped involucre oblont/, up- 

 pressed, tcith veri/ short and sliijlitly spreadim/ herbaceous tips ; acheues smooth. 



— Bogs and low grounds, Del. to Maine and northward, near the coast; also 

 I'ocono Mountain, Penn. A dwarf form (var. STufcTus, Gray) has oblong- to 

 linear-lanceolate nearly entire leaves, and usually solitary heads ; White Moun- 

 tains, N. H., to ].,Hb. Aug. — Kays light violet. Involucre nearly smooth, 

 excejjt the ciliate margins. 



» 2. Involucre and usualli/ the branchlcts viscldli/ or j)ntin(is( -//Idiiiliilar, uu II 

 imbricated or loose ; pubescence not silk// ; leaves entire {nr the lower icilh 

 few teellt), the cauline all sessile or clasping ; rays shoivi/, violet to purple. 

 ■\- Heads small ; involucre not sejuarrose. Extreme western. 



9. A. Fendleri, Gray. Kigid, 1° high or less; leaves firm, linear, 1- 

 nerved, hisi>id-(ili;ite, 1' long or mo.stly much less; heads .scattered, .'}" high; 

 scales linear-oblong, obtuse, or the inner acute. — Central Kan. (Kllis, Dr. L. 

 Watson) and southwestward. 



-(- -t- Heads lanjer ; involucral scedes spreading, in few or man// ra)ds. 



10. A. grandiflbrus, L. Rough icith minute hispid hairs; stems slender, 

 loosely much l)ranched (1-3° higli) ; leaves very small (?-!' long), oblong- 

 linear, obtuse, rigid, the uppermost passing into scales of the hemispherical 

 squarrose many-ranked involucre; rays bright violet (T long) ; achenes hairy. 



— Dry opeu j)laces, \'a. and southward. — Heads large and very showy. 



11. A. oblongifdlius, Nutt. Minutely glandular-puberulent, much 

 branched above, rigid, paniculate-corymbose (1-2° high) ; leaves narrowly ob- 

 long or lanceolate, mucronate-])ointed, partly clasping, thickish (1-2' long by 

 2 -5" wide); involucral scales nearly ecpial, broadly linear, appressed at the 

 ba.se; rays violet-purple; acheues canesceut. — Banks of rivers, from Penn. 

 and Va. to Minn, and Kan. — Heads middle-sized or smaller. 



Var. rigidulus, Gray. Low, Avith more rigid and hispidulous scabrous 

 leaves. — In drier jtlaces, 111., Wise., and southwestward. 



12. A. Novae-Anglise, L. aS7c/« s/o«/, /m/r_y (3 - 8° high), corymbed at 

 the summit; leaves very numerous, lanceolate, entire, acide, auriculate-clasping, 

 clothed with minute pubescence, 2-5' long ; scales nearly ecpial, linear-iiwl -shaped, 

 loose, glandular-viscid, as well as the branciilets ; rays violet-])urple (in var. 

 liosEL'S rose-purple), very numerous; achenes hairy. — Moist grounds ; com- 

 mon. — Heads large. A peculiar and handsome species. 



13. A. moddstus, Lindl. Pubescent or glabrate ; stem slender, simjde, 

 with few large lieads terminating slender brancldets; leaves lanceolate, very 

 acute, narrowed to a sessile base, sparingly serrate or serrulate; scales linear- 

 attenuate, equal, mostly herbaceous; rays blue. — N. Dak. and westward. 



* 3. Leaves whitened, silvery-silky both sides, all sessile and entire, mucronulate ; 

 involucre imbricated in 3 to several rows ; rays showy, purple-violet. 



14. A. serlceus, Vent. Stems slender, branched; leaves silver-white, 

 lanceolate or oblong , heads mostly solitary, terminating the short branchlets ; 

 S''(des of the globular involucre similar to the leaves, spreading, except the short 

 coriaceous ba.se; achenes s)H(>olh, many-ribbed. — Prairies ami dry l)anks, Wise 

 and Minn, to Ky., and southward. — Heads large ; rays 20-30. 



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