ORDEB 70. COMPOSITE. 427 



Scales in 5 or 6 series, closely imbricated ; rays longer tfian ike invol. ; aoJi. glab- 

 rous. Swamps, Fla. (Chapman.) A curious Aster, very slender, with large lids., 

 20 to 30-rayed, spreading 2', purple. 



47 A. linifolius L. SEA ASTER. St. paniculate, much branched from the base ; 

 Ivs.' long, linear, very acute, the uppermost subulate; invol. cylindric, with subu- 

 late scales in about 3 rows ; rays minu'e, in two series, scarcely exserted. An 

 annual species, found in salt marshes, Mass, to Car. St. 12 to 18' high, very 

 smooth, thick, reddish. Lvs. smooth, sessile. The plant is very branching, with 

 numerous small lids., almost discoid from the shortness of the rays. Aug. 



48 A. subulatus MX. Annual ; slender, much branched, glabrous ; branches 

 corymbed, slender ; Ivs. linear-subulate, scabrous, long-linear below ; scales lancc- 

 liuear, acute, in 2 or 3 series; rays numerous, narrow, longer than the disk, in one 

 row. Damp grounds, S. Car. to Fla. Sts. 1 to 3f high. Hds. small, with aboul 

 20 blue rays longer than the disk. Sept., Oct. (A. divaricatus Nutt.) 



3. EXILIS. Taller, with fewer branches, corymbed ; hds. racemed or solitary. 

 Rays pale purple. Columbus, Ga. (A. exilis Ell.) Height 2 to 4f. 



19. DIPLOPAP'PUS, Cass. DOUBLE-BRISTLED ASTER. (Gr. 

 double, TrdTTTTo^y pappus ) Heads many-flowered ; ray-flowers abo"nt 

 12, 9; disk-flowers $; involucre imbricate, scales narrow, destitute of 

 green tips ; receptacle flat, subalveolate ; pappus double, the exterior 

 very short (about i" long), interior copious, capillary ; achenia coin- 

 pressed. 2 Lvs. entire, alternate. Rays cyanic. Disk yellow. 



Rays violet. Achenia silky. Bristles of the inner pappus alike .................... X.. 1 



Kays whitish. Some of tbe longer bristles clavi-llato. Ach. sinoothish ........... N<. v'. 



Ach.vill.ms ................. No. 4 



1 D. linariifolius Hook. St. straight, roughish; branches 1 -flowered, f.istigi- 

 ate; scales imbricate, carinate, as long as the disk; Ivs. linear, entire, 1-veined. 

 mucronate, carinate, rough, rigid, those of the branches recurved. A handsome- 

 species, in dry woods, along streams, U. S. and Can. Stems subsimple, purplish. 

 about a foot high. Leaves numerous, obtuse, with a small, mueronate point, shin- 

 ing above. Branchlets near the top, leafy, each with one rather large and showy. 

 violet-colored head. Aug., Sept. (Aster, L.) 



2 D. iimbellaitus Hook. St. smooth, straight, simple; hds. numerous, in a level 

 corymb ; Ivs. long, lanceolate, smooth, acuminate at each end, rough on the mar- 

 gin; invol. scales obtusely lanceolate ; ach. pubescent in lines. Low grounds, river 

 banks, fields. K Eng. to La. St. 3 to 4f high (in dry fields but 1 to 2f) pur- 

 plish, channeled, branching at top into a largo, level-topped, compound corymb. 

 Lvs. narrow, entire, 4 to 6' in length, those of the branchlets smaller. Rays about 

 12, white. Disk yellow. Aug., Sept. (A. amygdalinus MX. A. umbellatus Ait.) 



0. AMYGDALisua St. roughish above, green ; branches of the corymb divari- 

 cate ; Ivs. broader. Lower and less elegant than variety a. Common. 



3 D. cornifolius Less. St. smooth below, scabrous and slightly paniculate 

 above, few-flowered : Ivs. elliptical, thin, long-acuminate at both ends, entire, with 

 scattered hairs, rough-edged, invol. scales imbricate, shorter than the disk, obtuse; 

 ach. glabrous. Grows in woods N. and M. States. "Whole plant nearly smooth, 

 erect, 1 to 2f high. Lvs. paler beneath, on very short sta'ks or sessile. Fls. few, 

 large; outer scales very short. Rays about 10, white. Jl., Aug. (Aster, Muhl.) 



4 D. obovatus Torr. & Gr. Cinereous-pubescent, corymbous above; Ivs. oblong- 

 obovate or elliptical, acute, sessile or the lower or short petioles, tomentous be- 

 neath; scales loose, linear-subulate, acute, in about 3 rows, downy, rusty yellow; 

 ach. silky- villous. Damp shades, S. Car. to Fla. Height 2 to 3f. Lvs. longer 

 lhan the internodes (2 to 3'), rarely with a few teeth. Invol. broadly obconic. 

 Rays narrow, white, spreading \\'. Pappus rusty white. Sept., Oct. (Aster, Ell.) 



20. ERIG'ERON, L. FLEA-BANE. WHITE-WEED. (Gr. r/p, the spring, 

 yepwv, old man ; because it is soon hoary.) Heads many-flowered, sub- 

 hemispherical ; ray-flowers ? , very numerous (40 to 200), narrow, lin- 

 ear; flowers of the disk $ ; receptacle flat, naked ', scales of the invo- 



