356 



COMPOSITAE. 



[Vol. III. 



A. Fendleri. 



45. A. grandifloriis. 



46. 



47- 



48. 



A. speclabilis. 

 A. surculosus. 

 A. gracilis. 



49. A. Radula. 



50. 

 5i. 



A. 

 A. 



A 

 A 



Herveyi. 

 turbinellus. 



Nebraskensis. 



paludosus. 



nemoralis. 



A. salicifolius. 

 A. paniculatus. 

 A. Missouriensis. 

 A. Tradescanti. 



62. A. Faxoni. 



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



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



\ Leaves bristly ciliate, linear, rigid; western species. 44. 



\ \ Leaves not bristly-eiliate. 



f Tips of tiie 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 1' broad or more. 

 Bracts of the involucre glandular. 

 Bracts of the involucre ciliate, or glabrous. 

 Involucre turbinate; heads 6" '-9" broad. 



f 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. 

 Involucre turbinate. 



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

 Leaves linear-oblong, entire, ciliolate. 

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



52. A. 

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



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

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

 # Heads corymbose, io"-2o" broad. 

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

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



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

 g Heads paniculate, or racemose, 4"-io" broad, 

 f 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 S"-io" broad. 



Plants glabrous, or sparingly pubescent above. 



Leaves firm, roughish or rough; rays often bluish. 58. 



Leaves thin, smoothish; rays chiefly white. 59. 



Plant puberulent all over. 60. 



Heads 6" -8" broad; stem-leaves narrowly lanceolate. 61. 



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

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

 Heads numerous, 4"~7" broad; upper leaves subulate. 



Paniculately branched, bushy. 63. A. ericoides. 



Simple, or with ascending slender branches; northern. 64. A. Pringlei. 



(b) Heads racemose and 1 -sided on the branches. 

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



Stem pubescent or glabrate. 65. A. lateriflora s. 



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



Stem-leaves linear-lanceolate to linear, nearly entire; stem glabrate. 67. A. vimineus. 



f f Bracts of the involucre, at least the outer, obtuse; plants very rough. 

 Heads $"-4." broad, very numerous, densely clustered. 68. A. mulliflorus. 



Heads 6-8 broad, rather loosely clustered; western. 69. A. incanopilosus. 



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



situations). 

 Perennial; heads 6"-i2" broad; involucral bracts lanceolate, acuminate. 70. A. tenuifolius. 

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



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



71. A. exilis. 

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



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 peduncled heads, its branches spread- 

 ing, 3' long, or less; 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; achenes glabrous. 



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

 its dense glomerules subtended by large short-elliptic 

 leaves. September. 



