Aster. COMPOSITE. 345 



p. 244; Torr. 4- Gr. fl. N. Am. 2. p. 132. A. polyphyllus, Willd. enum. 2. p. 888. A, 

 junceus, Pursh, fl. 2. p. 557. 



yax.\. ramosissimus : paniculately much branched; the branches and branchlets rigid, 

 somewhat erect, roughish-pubescent ; leaves often rough ; scales of the involucre more closely 

 imbricated and numerous, linear-subulate. Torr. <^ Gr. I. c. A. tenuifolius, y. Nees, I. c. 



var. 2. hellidiflorus : paniculate-compound, rather strict ; the branchlets and heads often 

 somewhat racemose ; leaves smooth, or frequently rough above ; scales of the involucre 

 narrowly linear, acute, loosely imbricated. Torr. <^ Gr. I. c. A. hellidiflorus, Willd. enum. 

 2. p. 886 ; Nees, Ast. p. 97 ; DC. prodr. 5. p. 240 ; Lindl. in Hook. fl. Bor.-Am. 2. p. 11. 

 A. dracunculoides, Willd. sp. 3. p. 2050. A. leucanthemos, Desf. ; Nees, I. c. ; DC. I. c. 



Stem 2-5 feet or more in height. Leaves variable in length and breadth, sometimes 

 broadly lanceolate, either sharply and often coarsely serrate, or nearly entire, narrowed at the 

 base, finely ciliolate on the margin. Heads middle-sized. Scales of the involucre acute or 

 acuminate, greenish, with a narrow pale margin. Rays numerous, considerably shorter than 

 the disk, pale purple or nearly white. 



Low grounds, etc. August - October. 



17. Aster Greenii, Torr. Sf Ghr. Green's Aster. 



Stem very smooth, racemosely branched or compound ; leaves nearly all remotely adpressed- 

 serrulate, smooth, acute or acuminate, rough above ; the cauline ones narrowly lanceolate, 

 elongated, slightly clasping (not dilated) at the base, spreading ; heads (hardly middle-sized) 

 simply racemose on the leafy branches, on very short bracteate peduncles ; involucre cam- 

 panulate, somewhat shorter than the disk ; the scales linear-lanceolate, acute, rather closely 

 imbricated in nearly 3 series , the exterior somewhat shorter. — Torr. <^ Gr. fl. N. Am. 2. 

 p. 134. 



Stem .... feet high. Radical leaves not seen ; cauline ones 3-5 inches long and about 

 half an inch broad, of rather firm texture, more or less rough on the upper surface ; those of 

 the branches nearly uniform in size and shape, and from half an inch to an inch in length 

 Heads racemose, or sometimes rather crowded along the slender branches. Scales of the 

 involucre pale, with a greenish midnerve. Rays rather short, broadly linear, purplish ? ; the 

 disk turning to reddish-purple. Achenia finely pubescent. 



Fields. Schenectady {Mr. Tuckerman). 



[Flora.] 44 



