ORDER 70.- COMPOSITE. 421 



1. BIOTIA, DC. CORYHBED ASTERS. 



1 A. corymbosus Ait. SL corymbous-fastigiate, nearly smooth, branches pu- 

 bescent ; Ivs. thin, ovate-acuminate, serrate, with sharp spreading teeth, the lower 

 cordate, peticlate, the petioles wingless; invol oblong, 6 to 9-rayzd, imbricate 

 with .close-pressed, acute scales. Common in dry woods, N. and Mid. States. 

 St. 2f high, often reddish, mors or less flexuous, Lvs. large, mostly smooth, the 

 upper becoming lanceolate, sessile. Hds, 4" long, in a broad, flat, open corymb, 

 with about 6 oblong, white or roseate rays. Aug. (Eurybia corymbosa Cass.) 



2 A. macropliyllus Willd. St rough-pubescent, widely branched ; Ivs. ovate, 

 petiolxte, serrate wfth short, depressed teeth-, rough, the upper ovate-lanceolate, 

 sessile, lower cordate, petiolate, petioks somewhat winged; invoL cylindric, closely 

 imbricate with oblong, acute scales; rays 8 to 15. Woods N. States and Can. 

 St. furrowed, 1 to 21' high, Lvs, often very large (6 to 10' by 3 to r ). Rays 

 white or pale blue. Hds. 6" long. Sept. (Eurybia corymbosa Cass.) 



2. CALTJ A STRUM, Torr, & Gr. YIOLET-FLOWERED ASTERS. 



3 A. mirabilis Torr. & Gr. Scabrous, simple below; Ivs. ovate, serrate, the 

 lowest $ etiolate, the others sessile, those of the branches roundish, small; iuvoL 

 hemispherical, shorter than the disk, scales imbricated, in 4 or 5 series succes- 

 sively shorter, with obtuse, green, recurved tips; rays about 20. Columbia, S. Car. 

 (ProC Gibbs in JS", Am. .Flora IL, 165). We have not met with tliis species. 



4 A. radula Ait Erect, simple below, angular; Ivs. lanceolate, acuminate, nar- 

 rowed to the sessile base, sharply serrate, rugous and rough ; invoL imbricate, 

 squarrous with the short spreading green tips of the scales. Moist groves and 

 hedges, Me. to Penn, Height 1 to 3fJ remarkable for its straight, smooth stem, 

 stiQ, sharply serrate Ivs. Branches nearly leafless, simple, each bearing a singlo 

 large head, rarely more, with 20 pale violet rays spreading IV. Aug., Sept 



5 A. spectabilis Ait Erect, rough-puberulent above; Ivs. roughish, oblong- 

 lanceoiata, sessile, entire, the lower obscurely serrate; branches corymbed ; invol. 

 hemispherical, with sqi&arrous, spreading, ciliate scales. A low, handsome Aster, 

 of'piae barrens, Mass, to N. J, and Ky. t 1 to 2f high, branching above into a 

 nearly simple corymb of 10 15 largo and showy heads, each with about 20 long 

 violet blu'3 rays. Sept. Nov. 



6 A. STirculosiis MX. Sts. arising from a knotted creeping rhizome, low, slender, 

 simple or corymfoous at top; Ivs. linear-lanceolate, entire or subserrate, upper 

 linear, clasping; lids. I to 5 ; scales linear-oblong, ciliate, inner obtuse, outer with 

 green spreading tips; rays about 20. Wet pino barrens, N. J. to N". Car. and 

 Tenn. Sts. smoothish, 12 to 18' hi^h, Rt-lvs, spatulate, 4 to C' long. Hds. 

 large, obconic, with violet-purple vays. Sept 



{3. GKACILIS Gray. Hds, smaller and more numerous (3 to 12), with the invol- 

 ucre moro close, and the rays about 12 (A. gracilis Nutt). 



7 A paludosnis L. Slender, glabrous; Ivs. long, linear, rigid, margins scarcely 

 rough, clasping at base; hds. 1 to 6, hemispherical; scales green, lance-linear, 

 so-mewhat spreading; rays about 30, longer than the (6 f/ ) involucre. Swamps in 

 pioe barrens, N. Car. to Fla. and La. Sts, 2 to 3f high. Hds. very large, with 

 vk>let-blae rays spreading 1 J to 2'. Pappus tawny. Aug. Oct 



3. ASTER proper. PANICLED ASTERS. 



8 A. cordifolius L. St paniculate, emoothish; lower Ivs. cordate, hairy 

 beneath, j-harply serrate, acuminate, petiolato; petioles winged; invoL closely 

 imbricate, the scales with short, green tips. Common in rocky woods, N. and W. 

 States. Stem with a handsome panicle of racemes at top of numerous, rather 

 small flowers. Rays 10 15, pale blue varying to white. Lower leaves large. 

 Petioles more or less winged, hairy. Above, the leaves aro gradually reduced 

 to small or minute bracts. Sept. 



9 A. sagittifdlins Wiild. ARROW-LEAVED ASTER. St with racemous branches 

 above, smooth ; Ivs. oblong-lanceolate, acuminate, sessile, serrato in the middle, 

 radical ones ovate, oblong, cordate-sagittate, serrato, pctiolato; invcL loosely 

 intricate, scales linear-subulate. Low woods, N. aud W. States and Can. Stem 



