322 LXXV. COMPOSITE. ASTER. 



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

 bunches ; scales linear. 



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

 Glabrous ; st. racemose-paniculate above ; ITS. 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 5f high, somewhat corymbose. Leaves 24' 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. 



P. altior. Branches hirsute or pubescent ; hds. above the middle size, with 

 blue rays. Stem 4 6f high. 



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

 rays pale blue. Stem 1 2f high. 



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

 racemed ; rays bluish- white. Western ! 



21. A. TENUIFOLIUS. Narrow-leaved 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. Greene's Aster. 



St. glabrous, racemosely branched ; IKS. 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. New 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 if 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 corymbose-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 ; roc. compound ; branches racemose at the summit or slightly 

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

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



Y. Ifetiflorus. T. & G. St. slender, with long, filiform, spreading branches; 

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

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

 considerable size, with very long, narrow leaves, and numerous, long, showy, 

 pale purple rays. 



26. A. LONGIFOLICJS. Lam. (A. loevigatus. Ph.) Long-kaved Aster. 

 Glabrous ; st. 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 3f high. 

 Leaves pale below, shining above, smooth both sides, the lower ones 46' long. 

 (leads numerous, showy, with 25^30 light blue rays. Nov. 



