322 LXXV. COMPOSITiE. Aster. 



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

 bunches ; scales linear. 



20. A. SIMPLEX. Willd. (A. salicifolius. Darl.) Willow-lcavcd Aster. 



Glabrous ; st. racemose-paniculate above ; lis. 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 

 ] — 51high, 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 lew, middle size, on the short branchlets. Sept. 



^. aliior. Branches hirsute or pubescent ; hds. above the middle size, with 

 blue rays. — Stem 4 — Gt high. 



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

 rai/s pale blue. — Stem 1— 2f high. 



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

 racemed ; rays bluish- white. — Western ! 



21. A. TENaTFOLius. Narrow-leavcd 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 — i' 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. Greene'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, Dr. Pickering. Cauline leaves 3 — 5' long, ramial 

 leaves much smaller. 



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



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

 acute, the lower subserrate and subclasping ; hds. racemose or corymbose ; scales 

 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 corj'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 Aster. 



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

 compound; /r.s. linear-lanceolate, elongated, mucronately serrulate, attenuate 

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



y. IcE'iprrns. T. & G. St. slender, with long, filiform, spreading branches ; 

 Ivs. rather rigid and very scabrous ; rat. 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, narrow leaves, and numerous, long, showy, 

 pale purple rays. 



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

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



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

 nearly equaling the disk. — Fields and thickets, N. Y. to Car. Stem 31 high. 

 Leaves pale below, shining above, smooth both sides, the lower ones 4 — 6' long. 

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



