164 ORDER 70. COMPOSITE. 



42 A. simplex Willd. Loosely corymbous-paniculate, emoothish: Ivs. .auceolate, 

 acuminate, the lower serrate ; heads scattered ; scales loosely imbricated, linear-snbu- 

 late. Low grounds : common. 3 6f. Heads twice larger than No. 41, blue to white. 



/3. ttiiers-rns. Diflusely branched, loosely racemons ; branches hairy in lines. 



43 A. teiiulfolins L. Paniculate-branching, with 1-flowered branchlets ; Ivs. linear- 

 lanceolate to lance-linear, slender-pointed, sessile, remotely serrulate, upper entire ; 

 scales linear-subulate, equalling the disk. Moist fields. 2 6f. 



0. bellidifiorus. Leaves scabrous, slightly clasping ; scales loosely imbricated. 

 y. dixtichuK. Leaves and strict ascending branches in 2 rows 1 111. (Mr. J. Wolf.) 



44 A, subasper Lindl. ? Pubescent above ; racemous-branched, branches short, 

 dense-fi wd. ; Ivs. lance-acuminate, appressed-serrate, rough, attenuate to a petiole, up- 

 per reduced, entire, sessile ; mvol. closely imbricated ; rays purp. Dry. 111. 2f. (Wolf.) 



45 A. erlcoides L. Smoothish; branches virgate, branchlets second, 1-headed ; Ivs. 

 lance-lin. to subulate ; hds. small ; sc. as long as disk, with subulate-mncronate spread- 

 ing tips. Rocky fields. l-3f. Lvs. 4'-4", attenuate-mncronate. Rays white or purplish. 



46 A. racemosus Ell. Rough-downy; branches slender, erect ; hds. very small (2"), 

 spicate-racemous, crowded above ; Ivs. linear, sessile, rigid, 3' 3". Coast, S. Car. 2f. 



47 A. mnltiflorus L. Grayish-downy, diffusely branched ; Ivs. linear, entire, sees., 

 obtusc-mucronate ; hds. small ; sc. with obtusish spreading tips. Dry fields. If. Very 

 bushy, with crowded racemes. Rays about 12, pale, 2 3" long. 



48 A, gramiiiilolius Ph. Slender, with filiform erect branches, 6- -12'' Ivs. linear, 

 crowded below ; ped. slender, leafless, 1-flwd. ; sc. subulate-linear ; rays abo..t20, white 

 or rose. Rocks, Vt. N. II. : rare. (Willoughby Lake, Vt., Bradford, Vt., Whi V* Mts.) 



49 A. acnminatus MX. St. simple, flexuous, angular, branching into a corymbous 

 panicle above ; Ivs. broad-lanceolate, narrowed and entire at the base, serrate and acu 

 minate ; scales lax, linear. Wooded hills, N. If. Rays 12 + , long, white. 



6O A. nemoralis Ait. Branches corymbed or ; ped. 1-flwd., nearly naked, filiform ; 

 Ivs. narrowly lanceolate, acute at each end, veinless, subentire : sc. very acute, loose, 

 shorter than the disk ; rays long, about 20. Wet woods. If. White-purple. 



51 A. ptarmlcoides T. & G. St. corymbous-fastigiate above; Ivs. lin. -lanceolate. 

 acute, rough-margined, entire, lower ones dentate, attenuated into a short petiole, 

 rays short, snow-white. Rocky shores, Vt. to Mo. Rare. Heads rather large. 



52 A. flexuosus N. Smooth, slender, flexuons; branches leafy, 1-flwd. ; Ivs. fleshy, 

 long-lancc-linear to subulate ; hds. large ; rays short, many, purple. Marshes. If. 



53 A. Chapmanii T. & G. Smooth, slender, strict; branches filiform, 1-flwd. ; Ivs. 

 linear-subulate ; rays longer than invol., 20 30, purp. ; cyps. glabrous. Swamps, Fla. 



54 A. linifolius L. Sea Aster. Smooth, much branched, paniculate; Ivs. lance- 

 linear to subulate ; scales in 3 rows ; rays minute, scarcely ex?erted. Marshes. If. 



55 A. 8ubula.tns MX. Smooth, slender, much branched, corymbed; Ivs. linear- 

 subulate ; rays many, narrow, in 1 row, longer than the disk, blue. Wet. S. 1 3f. 



Taller (2 4f ), less branched ; heads few, rays pale purple. Ga. 



19. DIFLOPAPPUS, Cass. DOUBLE-BRISTLED ASTER. Ray-flowers 

 about 12, $ . Disk-flowers GO, 5 . Invol. imbricate. Scales narrow, des- 

 titute of green tips. Recep. flat, subalveolate. Pap. double, the exterior 

 very short (about " long), interior copious, capillary. Fruit compressed. 

 2f Lvs. entire, alternate. Heads corymbous or few, rays cyanic, disk yellow. 



$ Rays violet. Achenia silky. Bristles of the inner pappus alike. Sept. Oct ..... No. 1 

 $ Ray 8 whitish. Some of the longer bristles clavellate. Ach. smoothish. Ang..Nos.2,3 



Ach. villous. Sept. Oct. . .No. 4 



1 D. linariifolius Hook. St. clustered, leafy ; branches 1-flwd., fastigiate ; Ivs. lin., 



entire, 1-veined, obtuse, rigid, rough. Dry-places. If. Heads rather large, showy. 



2 D. umbellatus Hook. Smooth, simple, strict, with GO heads in a level corymb; 



