Oedee 70.— OOMPOSITjE. 421 



§ 1. BIOTIA, DC. COETMBED ASTEH3. 



1 A. coiymbdsuB Ait. SL corymbous-faatigiate, nearly smooth, branches pu- 

 bescent ; Ujs. thin, ovate-acuminale, serrate, with sharp spreading teeth, the lower 

 cordate, petiolate, the petioles wingless ; invol oblong, 6 to O-rayed, Imbricato 

 with dose-pressed, acuto scales. — Common iu dry woods, N. and Mid. States. 

 SL 2fhigh, often reddish, more or less flexuous. Iivs. large, mostly smooth, ti:c 

 upper becoming lanceolate, sessile. Hds. i" long, iu a broad, flat, open corymb, 

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



2 A. macropb^llas Willd. St. rough-pubescent, widely branched; Ivs. ovate, 

 petiolate, serrate with short, depressed teeth, rough, the upper ovate-lanceolate, 

 sessile, lower cordate, petiolate, petioles somewhat winged ; invol. cylindric, closely 

 imbricate with oblong, acute scales; r.ays 8 to 15. — Woods N. States and Catj. 

 St furrowed, 1 to 2f high. Lvs. often very large (G to 10' by 3 to 6''). Rays 

 white or pale blue^ Hds. G" long. Sept, (Eurybia corymbosa Cass.) 



§ 2. CAIiLIASTRtTM, Torr. & Gr. Violbt-Floweeed Astees. 



3 A. mirabilis Torr. & Gr. Scabrous, simple below; lvs. ovate, serrate, tue 

 lowest petiolate, the others sessile, those of the brandies roundish, small ; invo;. 

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

 sively shorter, with dbtijtse, green, recurved tips ; rays about 20. — Columbia, S. Cai . 

 (Prof. Gibbs in N. Am. Flora II., 165). We have not met with this specie. 



4 A. rddula Ait. Erect, simple below, angular ; lvs. lanceolate, acuminate, nar- 

 I'owed to the sessile base, sharply serrate, rugous and rough ; invol. imbricate, 

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

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

 stiff, sharply serrate lvs. Branches nearly leafless, simple, each bearing a single 

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



5 A. spectdbilis Ait. Erect, rough-puberulent above; lvs. roughish, oblong- 

 lanceolate, sessile, entire, the lower obscurely serrate ; branches corymbed ; invo!, 

 hemispherical, with squarrous, spreading, ciliate scales. — A low, handsome Astei, 

 of pine barrens, Mass. to N. J. and Ky. St. 1 to 2f high, branching above into a 

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

 violet blue rays. Sept, — Nov. 



6 A. snrculdsiis Mx. Sts. arising from a knotted creeping rhiwme, low, slende.-, 

 simple or corymbous at top; lvs. linear-lanceolate, entire or subserrale, upper 

 linear, clasping ; hds. 1 to 5 ; scales linear-oblong, ciliate, inner obtuse, outer with 

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

 Tenn. Sts. smoothish, 12 to 18' high. Rt.-lvs. spatulate, i to C long, Hds. 

 large, obconic, with violet-purple rays. Sept 



/§. GE.4.CILIS Gray. Hds. smaller and more numerous (8 to 12), with the invol- 

 ucre more dose, and the rays about 12 (A. gracilis Nutt). 



7 A palud6sus L. Slender, glabrous ; lvs. long, linear, rigid, margins scarcely 

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

 somewhat spreading; rays about 30, longer than the (6'') involucre. — Swamps in 

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

 violet-blue rays spreading 1} to 2'. Pappus tawny, Aug, — Oct, 



§ 3. ASTER PROPER. Teue Astees. 



8 A. cordifolnis L. St paniculate, smoothish ; lower lvs. cordate, hairr 

 beneath, sharply serrate, acuminate, petiolate; petioles winged; invoL closehj 

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

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

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

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

 to small or minute bracts. Sept 



9 A. sagittifolius Willd. Arbow-leaved Astee. St -nnth racemous branches 

 above, smooth; lvs. oblong-lanceolate, acuminate, sessile, serrate in the middle, 

 radical ones ovate, oblong, cordate-sagittate, serrate, petiolate; invol. loosely 

 imbricate, scales linear-subulate. — Low woods, N. and W. States and Can, SleiB 



