322 LXXV. COMPOSIT^E. Aster. 



and narrow, midvein hirsute ; hds. racemose or spicate, upper in short, dense 

 bunches ; scales linear. 



20. A. SIMPLEX. Willd. (A. salicifolius. Dad.) Willow-leaved Aster. 



Glabrous ; st. racemose-paniculate above ; Ivs. lanceolate, acuminate, en- 

 tire, the margins scabrous, lower ones serrate ; scales loosely imbricated, linear- 

 subulate. — Another variable species in low grounds, U. S. and Can. Stem 

 1 — Sfhigh, somewhat corymbose. Leaves 2 — 4' by 5 — 10", very smooth both 

 sides, tapering to a slender point ; those of the branches and branchlets propor- 

 tionately smaller. Heads rather few, middle size, on the short branchlets, Sept. 



IS. aliior. Branches hirsute or pubescent ; Ms. above the middle size, with 

 blue rays. — Stem 4 — 6f high. 



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

 rays pale bl-ue.— Stem 1— 2f high. 



'6. recurvaius. Diffuse, with long, spreading or recurved branches ; hds. loosely 

 racemed ; rays bluish- white. — Western ! 



21. A. TENUiFOLius. Narraio-Uavcd Aster. 



St. smooth, erect, paniculate-branching, with 1-flowered branchlets; Ivs 

 linear-lanceolate, tapering at each end, long-acuminate, entire, with roughish 

 margins, the lower ones often serrate in the middle ; invol. scales lax, acute. — 

 Grows in moist fields. Can. to Va. Stem leaves 2 — 4' long, those of the branches 

 and branchlets proportionately smaller. Heads small, with numerous (20 — 30), 

 long, pale purple rays. Sept. 



22. A. Greenei. Torr. & Gray. Ch-eene's Aster. 



St. glabrous, racemosely branched ; Ivs. glabrous, subclasping, remotely 

 appressed-serrulate, scabrous above, lower narrow-lanceolate, upper short, nu- 

 merous, ovate-lanceolate ; hds. rather small, on short, bracted peduncles. — Near 

 Boston. Dr. B. D. Greene, D^r. Pickering. Cauline leaves 3—5' long, ramial 

 leaves much smaller. 



23. A. Novi-Belgii. New York Aster. 



Glabrous; 5^. terete, stout, often glaucous; Ivs. rather rigid, lanceolate, 

 acute, the lower subsen-ate and subclasping ; hds. racemose or corymbose ; scaUs 

 rather loosely imbricated, lanceolate, subequal, with acute green tips ; rays 

 numerous. — A smooth, handsome Aster in Western and Southern States, not 

 common. Stem 2 — 4f high, with few, straight, somewhat corymbose branches. 

 Leaves 4 — 6' long, tapering to each end. rough-edged, upper ones much smaller. 

 Heads rather large. Rays pale blue, expanding 9 — 12". Aug. — Oct. 



1 1 Scales spreading or squarrose at tip. 



24. A. LAXUs. Loose-stalked Aster. 



St. loosely cor)^mbose-panicled above ; Ivs. linear-lanceolate, acuminate, 

 rough-edged, lower ones subserrate, those of the stem subreflexed, of the branches 

 much spreading ; invol. imbricate, scales lanceolate, acute, reflexed at the apex. 

 — Fields, Mass., N. Y. Stem 2 — 3f high, with .small, bluish flowers. Sept. Oct. 



25. A. LAXiFOLius. Nees. Loose-leaved As/cr. 



St. scabrous ; rac. compound ; branches racemose at the summit or slightly 

 compound; Zrs. linear-lanceolate, elongated, mucronately serrulate, attenuate 

 ■ at each end. clasping at base, scabrous above ; scales squarrose. 



y. latijlorus. T. & G. St. slender, with long, filiform, spreading branches ; 

 hs. rather rigid and very scabrous ; rac. loose, the pedicels nearly leafless. — 

 Ohio and Wis. Described by Drs. Torrey tf* Gray as a very graceful plant of 

 considerable size, with very long, narroAv' leaves, and numerous, long, showy, 

 pale purple rays. 



26. A. LONGiFOLiL-s. Lam. (A. Iccvigatus. Ph.) Long-leaved Aster. 

 Glabrous; 5/. very branching, branches many-flowered; Ivs. subamplexi- 



caul, linear-lanceolate," lower ones serrate, smooth; invol. scrUes lax, lanceolate, 

 nearly equaling the disk. — Fields and thickets, N. Y. to Car. Stem 3f high. 

 Leaves pale below, shining above, smooth both sides, the lower ones 4 — G' long. 

 Heads numerous, .showy, with 25—30 light blue rays. Nov. 



