424 Obdeb to.— composite. 



24 A. turbinfiUus Lindl. Smooth or slightly scabrous; branches nnd branchlet* 

 very slender ; Ivs. lanceolate, tapering to each end, acute, slightly clasping, entire ; 

 inTol. clavate-turbinate, acute at base, as long as the disk fls. (6") ; scales im- 

 bricated in many rows, linear, obtuse, -with short green tips. — Woods and river 

 bottoms, 111. (Mead.), Mo., etc., to La. Sts. 2f high, somewhat corymboas. 

 Lower Ivs. 3 to 5' by J to 1-J-', the others gradually reduced upwards to the scales. 

 Hds. middle size, with blue rays and brownish pappus. Sept. 



25 A. durndsus L. Smooth or puberulent; branches racemous-panicled, Ivs. 

 numerous, smooth, linear, sessile, entire or the lowest subserrate, those of the 

 branches veiy short ; invol. obtuse at base, closely imbricate ; scales obtuse. — 

 About 2f high, in dry shades and borders of woods, IT. S. St. much branched, 

 very leafy, the lower Ivs. 2 to 3' long, the upper smaller and becoming very minute. 

 Hds. small, with about 24 purplish-white rays. Quite variable in respect to tha 

 extent of its branching inflorescence, the acuteness and size of its Ivs., the obtusc- 

 nessof its scales, etc. Rt. Ivs. 1 to 3' long, st. and branch Ivs. 2 fo 12''long. Sept. 



/8. OOBIDIFOLIUS ia a starved, attenuate form, very slender every way. 

 "26 A. cdrneus L. Smooth ; st. dividing into many straight, paniculate, leafy 

 branches ; Ivs. uniform, linear-lanceolate, acufninate, entire, the lower ones taper- 

 ing to a sessile base, the upper amplexioaul; scales rather acute, close, much 

 shorter than the disk. — A handsome bushy Aster, by fences, etc. (Claremont), N. 

 H., "W. to Ind. Bare. St. about 2f long, often purple. St. Ivs. 3 to 5' by 4 to 

 6", branch Ivs. much smaller. Hds. numerous, middle size, somewhat secund, 

 each with 20 to 30 pale purple, narrow rays. Sept., Oct. 



27 A. ericoides L. Nearly or quite smooth ; branches virgate, spreading, secund, 

 paniculate ; Ivs. linear or lanee-linear, very smooth, those of the branches subulab; 

 and approximate, short, of the stem long, of the root obloug-spatulate ; rays as 

 long as the disli ; invol. loose, scales mucronate, with subulate green tips as long a-, 

 the disk. — Grows ia rocky fields, in most of the States. St. 1 to 3f high, with 

 numerous brittle branches and branchlets forming a pyramid, and terminated 

 each by a single pale-purple flower. Lvs. rather numerous 3" to 1' in length. 

 Hds. small, white, about 20-rayed. Sept. 



28 A. raoemosus Ell. Sough-pubescent, with many erect branches; lvs. linear 

 and linear-subulate, very acute, margins very scabrous; hds. spicate-racemed 

 and crowded on the upper part of the branches ; scales very acute, as long as the 

 disk, somewhat spreading, rays very short. — -S. Car. to Ha. on the islands and 

 coast. St. 2 to 3f high. The very small heads (2" long) are almost ravless. 

 Sept., Oct. 



29 A. simplex Willd. Glabrous; .it. corymbous-paniculaie above; lvs. lanceolate, 

 acuminate, entire, the margins scabrous, lower ones serrate ; scales loosely imbri- 

 cated, linear-subulate. — Another variable species in low grounds, U. S. and Can. 

 St. 1 to of high, somewhat corymbous. Lvs. 2 to 4' by 5 to 10", very smooth 

 both sides, tapering to a slender point; tliose of the branches and branchlets 

 proportionately smaller. Hds. rather few, middle size (4 to 5" long), on the 

 short branchlets. Sept. 



j3. Iltior. Branches hirsute or pubescent ; hds. above the middle size, with 



blue rays. — St. 4 to 6f high. 

 y. HUMILIOB. Branches pubescent, with short, crowded spikes of small heads ; 



rays pale blue. — St. 1 to 2f high. 

 d. REcnRVATUs. Diffuse, with long, spreading or recurved branches ; hds. 



loosely racemed ; rays bluish white. — "Western. 



30 A. tenuifdlius L. St. smooth, erect, paniculate-branching, with X-flowered 

 branchlets ; lvs. linear and linear-lanceolate, tapering at each end, long-acuminate, 

 entire, with roughish margins, the lower ones often serrate in the middle ; invol. 

 scales very slender, erect, acute, slightly longer than the dish. — Grows in moist 

 fields. Can. to Va. St. lvs. 2 to 4' long, those of the branches and branchlets 

 proportionately smaller. Hds. 3 to 4" long, with numerous (20 to 30) long, pals 

 purple rays. Sept. 



31 A. Tradescdnti L. Smooth or smoothish ; branches virgate, paniculate ; 

 Ivs. lance-linear, the lower remotely serrate, sessile ; invol. closely imbricate ; 

 scales linear-filiform, scarcely equaling the disk. — A fine species, with numerous 



