182 COMPOSITE. Aster. 



ii. 120, not Wall. A. Baldwinii, Torr. & Gray, Fl. ii. 127, from specimens with rameal 

 leaves only, — Dry ground, S. Carolina to Plorida and Louisiana. (Named as distinct new 

 species in herb. Poiret and herb. Banks.) 



+++-!-++ Leaves nearly all sharply serrate, thinner, none cordate-clasping either by base of 



upper sessile ones or by appendage at base of petiole. 

 = InA'olucral bracts obtuse or obtusish with conspicuously marked and definite y^ry short green 

 tips : heads small and numerous. 



=»A ■ cordifolius, L. Green, slightly pubescent to nearly ghibrous, paniculately much 

 branched above into tliyrsoidal inflorescence of very many small heads : leaves membrana- 

 ceous, acutely serrate, cordate-ovate on nearly naked petioles, or uppermost lanceolate and 

 sessile, acuminate: heads 2 or 3 lines high: rays only 10 to 12, pale violet or whitish. — 



. Spec. ii. 875, mainly (Hort. Cliff., & syn. Coruuti & Morison) ; Ait. 1. c. 207; Lindl. Bot. 

 Reg. t. 1597 (unusual form) ; Pursh, Fl. ii. 552; Torr. & Gray, Fl. ii. 120; Gray, Proc. Am. 

 Acad. xvii. 165. A. paniculatus &, A. heterophyllus, Willd. Spec. iii. 2035. A. paniculatus, 

 heterophyllus, & cordifolius, Nees, Ast., chiefly. — Common in woodlands, New Brnnswick to 

 the mountains of Georgia, west to Wisconsin and Missouri. A singular abnormal state, 

 collected by Moser on the Pocono in Pennsylvania, has some of the lower cauline leaves 

 lanceolate and laciniate ; others oblong-ovate, simply serrate, barely subcordate-contracted 

 into a winged petiole : perhaps a hybrid with A. diffusus. 



=: = Involucral bracts acute or acutish, with the green tips more indefinite. 



a. Heads ratiier larger than in the la.st preceding (3 or 4 lines high), immerou.^', tbyrsoid-paniculate 

 on the rather rigid branches: stems rather stout, 2 to 6 feet high; leaves mostly gradually 

 acuminate. 



I- A. Drummondii, Lindi,. Pale with a iine and mostly soft cinereous pubescence : leaves 

 from cordate to cordate-lanceolate and mostly on margined petioles, or the small uppermost 

 lanceolate and sessile by a narrow base, obtusely or acutely serrate (the large 4 inches, smaller 

 about an inch long), sometimes scabrous above: bracts of the involucre acute or acutish : 

 rays violet-blue or paler, 3 to 5 lines long. — Hook. Comp. But. Mas;, i. 97, &, DC. 1. c. 234 ; 

 Torr. & Gray, 1. c. — Open grounds and border of woods, Illinois and Minnesota to Texas. 

 Forms pass into the next. 



' A. sagittif olius, Willd. Green, from glabrous to sparsely pilose-pubescent : stem strict, 

 2 or 3 feet high : leaves oblong- and ovate-lanceolate, acutely more or less serrate ; radical 

 and lowest cauline narrowly cordate, on naked petioles ; upper subcordate or truncate at 

 base and contracted into a winged petiole (3 to 5 iiulies long) ; uppermost linear-lanceolate 

 and sessile : heads densely thyrsoid-paniculate : bracts of the iuvolncre subulate-linear and 

 mostly attenuate, the tips rather loose: rays purplish, pale violet, or bluish, sometimes 

 nearly white. — Spec. iii. 2035; Nees, Ast. 56; Hiook. FL ii. 9; Torr. & Gray, Fl. ii 121. 

 A. rordifoliiis, Willd. 1. c, as to spec, from Muhl. A. paniculatus, Mnbl. Cat. ; Darlingt. Fl. 

 Cest. 464. A. hirteltus & A. uroplujlhis, Lindl. in DC. Prodr. v. 233, from " St. Louis, Dntm- 

 mond," not " Louisiana." — Open grounds, Canada and W. New York to Dakota, Jl'issouri, 

 and Florida. 



h. Heads larger (4 or 5 lines high) and comparatively few in a loose thvrsus or panicle terminating 

 the simple stem: only lowest leaves cordide or subcordate: involucral bracts looser and less 

 imbricated. 



>A. Lindleyanus, Toek. & Gn vt. Green, sparsely pilose or nearlv glabrous : stem 10 to 

 20 inches high, rather stout, the smaller j.lants bearing few heads : radical and lowest cauline 

 leaves o;ate, moderately or some obscurely cordate, on winged or margined jictioles ; npp-r 

 ovate- to oblong-lanceolate ; uppermost sessile and acuminate at both c'nds : bmcts of the in- 

 volucre linear-attenuate; the outer little shorter: ravs pale violet, 3 to 5 lines Ion"-. — Fl. 

 ii. 122. A. paniculatus, Ait. Kew. iii. 207; Hook. V\ ii. 8 (chieilV), not Lam. A°pnicox, 

 Lmdl. m Ho(,k. Fl. ii. 9, not Willd. - Labrador to Upper Can:ul:i, Lake Superior Sas- 

 katchewan, and tlie borders of British Columbia. The origin alof the species was raised by 

 Gordon from Labrador seeds, and has more extended inflorescence of smaller lioads than is 

 common in the wild plant. 



Var. ciliolatus [A. nlin/atus, Lindl. in Hook. Fl. & DC. Prodr. 1. c. 235) is a dwarf 

 arctic form, a span to 8 inclies high, bearing few (not cordate) leaves and only 2 to 7 heads ; 

 from Slave Lake, Richardson. 



