356 



COMPOSITAE. 



[Vol. III. 



A. Fendleri. 



45. A. grandiflorus. 



46. 

 47- 

 48. 



A. speclabilis. 

 A. surculosus. 

 A. gracilis. 



58. A. salici/olius. 



59. A. paniciilatits. 



60. A. Missouriensis. 



61. A. Tradescanli. 



62. A. Faxoni. 



63. A. eticoides. 



64. A. Pringlei. 



2. Leaves neither silky, silvery nor canesceni, often toothed. 



^ Rays normally purple, blue, pink, or violet ; not white. 



\ Leaves bristly cilialc, liticar, rigid; western species. 44. 



\ iJ Leaves not bristly-ciliate. 



t Tips of tile involucral bracts strongly squarrose. 



Leaves linear to linear oblong, rigid, obtuse, entire; heads 2' broad. 



Leaves lanceolate to oblong, at least the lower dentate. 



Involucre hemispheric, or nearly so; heads i' broad or more. 

 Bracts of the involucre glandular. 

 Bracts of the involucre ciliate, or glabrous. 

 Involucre turbinate; heads 6"-<)" broad. 



t t Tips of the involucral bracts appressed, or erect (except in forms of No. 50). 

 (a ) Bracts of the involucre coriaceous or herbaceous, oblong, lanceolate, or spatulate. 

 Bracts of the involucre coriaceous, obtuse. 



Involucre hemispheric; leaves oblong, sharply serrate; stem smooth. 49. A. Raditla. 

 Involucre turbinate. 



Leaves ovate-oblong, the lower dentate; stem rough. 50. A. Herveyi. 



Leaves linear-oblong, entire, ciliolate. 51. A. lurbinetlus. 



Bracts of the involucre herbaceous, foliaceous, acute; leaves oblong, very rough. 



52. A. JVebrastensis. 

 Bracts of the involucre rigid, lanceolate, large, acute; leaves linear. 53. A. palndosus. 



(b) Bracts of the involucre linear-subulate, membranous, acute. 54. A. ncnioralis. 

 •,r -;v Rays mostly white or nearly so (often pink or purple in Nos. 55, 57, 58 and 59). 

 i* Heads corymbose, io"-2o" broad. 

 Leaves ovate-oblong, acuminate, sharply serrate; bracts linear-subulate. 55. A. acuminatus. 

 Leaves linear, entire, or nearly so; bracts oblong, obtuse. 56. A. plarmicoides. 



\ \ Heads solitary at the ends of slender branchlets. 57. A. dumosus. 

 i; i( i; Heads paniculate, or racemose, 4"-io" broad. 

 t Bracts of the involucre acute to obtusish; plants glabrous or pubescent. 

 (a) Heads paniculate, not in i-sided racemes. 

 Stem-leaves lanceolate, serrate or entire. 

 Heads 8"-io" broad. 



Plants glabrous, or sparingly pubescent above. 



Leaves firm, roughish or rough; rays often bluish. 

 Leaves thin, smoothish: rays chiefly white. 

 Plant puberulent all over. 

 Heads 6"-8" broad; stem-leaves narrowly lanceolate. 

 Stem-leaves linear-lanceolate to subulate, mostly entire. 

 Heads scattered, 6"-9" broad; upper leaves linear. 

 Heads numerous, 4"-"" broad; upper leaves subulate. 

 Paniculately branched, bushy. 

 Simple, or with ascending slender branches; northern. 



(b) Heads racemose and i -sided on the branches. 

 Stem-leaves oval, oblong, or lanceolate, serrate, or chiefly so. 



Stem pubescent or glabrate. 65. A.laleriflorus. 



Stem villous; leaves narrowly lanceolate, thin. 66. A. hirsuticaulis. 



Stem-leaves linear-lanceolate to linear, nearly entire; stem glabrate. 67. A. I'iminetis. 



t t Bracts of the involucre, at least the outer, obtu.se; plants very rough. 

 Heads 3"-4" broad, verj- numerous, den.sely clustered. 68. A. multiflorus. 



Heads 6"-S" broad, rather loosely clustered; western. 69. A. incanopilosus. 



D. Leaves fleshy, narrow, entire; plants of salt marshes or saUne soil (No. 71 sometimes in non-saline 



situations). 

 Perennial: heads 6"-i2" broad; involucral bracts lanceolate, acuminate. 70. A. tcnui/olius. 

 Annuals; heads 3"-5" broad; involucral bracts linear-subulate. 



Involucre campanulate; disk-flowers more numerous than the rays; rays about 2" long. 



71. A. e.vilis. 

 Involucre cylindraceous; disk-flowers fewer than the very short rays. 72. A. subulatiis. 



I. Aster carmesinus Burgess. Crimson-disk Aster. (Fig. 3735.) 



Stems erect, delicate, closely tufted, i°-2° high, 

 glabrous, reddish brown, terete. Leaves all peti- 

 oled, glabrate, very thin, but firm and crisp, the 

 lower and basal ones oval, rounded, or with a small 

 deep and rounded sinus at the base, bluntly acute 

 or short-acuminate at the apex, crenate-serrate, the 

 upper ones sometimes ovate-lanceolate, the upper- 

 most short-elliptic; petioles slender, the uppermost 

 sometimes winged; inflorescence 5' broad, or less, 

 usually of about 5 convex glomerules, each often 

 of 10-15 short peduucled heads, its branches spread- 

 ing, 3' long.orless; rays chiefly 6, white; disk at first 

 golden yellow, finally deep purplish crimson; florets 

 broadly bell-shaped; outer bracts obtuse, ciliate, 

 pale, with a green tip; acheues glabrous. 



On shaded rocks, near Yonkers, N. Y. Peculiar in 

 its dense glomerules subtended by larg^e short-elliptic 

 leaves. September. 



