Order 10.— COMPOSITE. 427 



scales in 5 or 6 eerios, closely imbricated; rays longer than the invol. ; acli. glob' 

 rmis. — Swamps, Fla. (Chapman.) A curious Aster, very slender, with largo hds., 

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



47 A. liiiifoUus L. Sea Aster. St. paniculate, much branched from the baso ; 

 ivs. long, linear, very acute, the uppermost subulate; invoL cylindric, with subu- 

 late scales in about 3 rows ; rays minute, in two scries, 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 13 very branching, with 

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



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

 corymbed, slender ; lvs. linear-subulate, scabrous, long-linear below ; scales lanco- 

 linear, acute, in 2 or 3 series; rays numerous, narrow, longer than tlie disk, in one 

 row. — Damp grounds, S. Car. to Fla. Sts. 1 to 3f high. lids, small, with about 

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



3. EXiLis. Taller, with fewer branches, corymbed ; hds. raccmed or solitary. 

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



19. DIPLOPAP'PUS, Cass. Double-bristled Aster. (Gr. 6i~X6og, 

 double, Trdrr-oc, pappus ) Heads many-flowered ; ray-llowers about 

 12, ? ; disk-liowcrs # ; involucre imbricate, scales narrow, destitute of 

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

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

 pressed. — li Lvs. entire, alternate. Rays cyanic. Disk yellow. 



§ Kays violet. Achenia silky. Bristles of the inner pappus alike No, 1 



| Bays whitish. Some, of the longer bristles clavellate. — Ach. smoothish ...Nos. 2, 8 



— Ach. villous No. 4 



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

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

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

 species, in dry woods, along streams, U. 8. and Can. Stems subsimple, purplish, 

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

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

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



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

 corymb; lvs. long, lanceolate, smooth, acuminate at each end, rough on tho mar- 

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

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

 plish, channeled, branching at lop into a large, level-topped, compound corymb. 

 Lvs. narrow, entire, 4 to 0' ia length, those of the brauchlets smaller. Rays about 

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



3. AiiYGDALiN'US. St. roughisli above, green; branches of tho corymb divari- 

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



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

 above, few-flowered ; lvs. elliptical, thin, long-acuminate at both ends, entire, with 

 scattered hairs, rough-edged, invol. scales imbricate, shorter than tho 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 stalks or sessile. Fla few, 

 large; outer scale3 very short. Rays about 10, white. Jl., Aug. (Aster, Muhl.) 



4 D. obovatus Torr. & Gr. Cinerous-pubescent, corymbous above; lvs. oblong- 

 obovate or elliptical, acute, sessile or tho 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 

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

 Rays narrow, white, spreading IV. * Pappus rusty white. Sept., Oct. (Aster, Ell.) 



?0. ERIG'ERON, L. Flea-bane. AYhite-weed. (Gr. i)p, the spring, 

 yepojv, 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- 



