OitEEit 10.— COMPOSITE. 439 



6f high, furrowed, branching, and downy above. Radical lv3. very large (1 to 3f by 

 6 to 12'), serrate, those of the stem clasping. Hds. large, solitary, terminal. 

 Rays linear, with 2 or 3 teeth at the end. Esteemed as a tonic and expectorant. 

 Jh, Aug. § 



34. PLITCHEA, DC. Marsh Flea-bane. Heads many-flowered, 



those of tho margin $,rof the center £ , but sterile; involucre imbri- 

 cated ; receptacle flat, naked ; style undivided ; pappus capillary, 

 simple. — Strong-scented herbs, with alternate lvs. and corymbs of 

 purple fls., and copious, reddish pappus. 



1 P. caaipliorata DC. Lvs. ovate-lauccolate. somewhat pubescent, acnto, ses- 

 sile or short-peiioled, serrate, serraturcs mucronate ; fls. in crowded corymbs. — 2£ 

 A fleshy strong-scented plant, native of salt marshes, Mass. to Flor. Stem a foot 

 high, thick, downy, with alternate lvs. and axillary branches. Fls. light purple. 

 Aug. (Conyza caaipliorata Muhl. C. Marilandica Mx.) 



2 P. foStida DC. Erect, nearly glabrous, very leafy; lvs. broadly lanceolate, 

 acute or acuminate at each end, petiolate, feather-veined, obtusely subserrate ; hds. 

 numerous, in paniculate corymbs; scales ovate-lanceolate, acute. — A strong-scented 

 plant, in open, hilly grounds, Western States. St. 1 — 2f high, subsimple. Lvs. 

 4 — 7' by U — 3', sprinkled with minute dots; petioles \ — 1 long. lids, numer- 

 ous. Aug. — Oct. (B iccharis, L. Conyza camphorata Ph.) 



3 P. bifrons DC. Pubescent, leafy ; lvs. oval-oblong, acute, finely serrate, cor- 

 dale-amplexicaul, veiny ; hds. in compound, corymbous clusters. — Moist, low lands, 

 S. Car. to Fla. and La. Sts. 1 to Sfhigh, strict Lvs. 2 to ::' long, 1' wide. Fls. 

 very numerous, as in the other species, dull purple. Jl. — Sept. 



35. BAC'CHARIS, L. Groundsel Tree. (From Bacchus, wine ; 

 its fragrance resembling that of wine.) Heads discoid, many-flowered, 

 dioecious ; involucre imbricate, cylindric, or ovate, with subcoriaceous, 

 ovate scales ; sterile flowers with the stamens exserted ; receptacle 

 naked ; pappus capillary. — Shrubby plants, with alternate lvs. and 

 white fls. 



1 33 halimifdlia L. Glabrous, whitish-scurfy; lvs. obova% incisely dentate above, 



the highest lanceolate, panicle compound, leafy ; fascicles pedunculate, terminal, in 

 a dense panicle. — Ct., N. Y. to Ga. An elegant shrub, 6 to 12 f high, growing on 

 sea-eoast and river alluvion. Every part is covered with white dust. The fertik) 

 hds. growing upon separate plants aro in large, loose, terminal panicles, and fur- 

 nished with very long, slender pappus. Cor. white, 20 iu each head. Sept.— - 

 Merits cultivation. 



2 B. aiigustifdlia Mx. Glabrous, diffusely branched ; lvs. linear, sessile, entire; 

 hds. small, 15 to 20-flowered, cylindrical, axillary, loosely paniculate. — S. Car, 

 Fla., and La. T in the edge of salt marshes. A tine shrub, C to lOf high, with 

 slender, tough branches. Lvs. 2 to 3' long, 1 to 3" wide, acute. Hds. less than 

 2 ' long, ia a diffuse, leafy panicle. Sept., Oct. 



3 B. glomeruliflora Pers. Glabrous, minutely scurfy ; lvs. all obovate tapering 

 to a short petiole, very obtuse, repand-few-toothed ; hds. in sessile glomerules, in the 

 axils of the dipper lvs. — Va. to Fla. and La., along the coast. St. 3 to 5f high, 

 pale green as well as the whole plant. Lvs. 1 to 2' long, 3 as wide. lids, thrice 

 larger (3" long and wide) than iu No. 1. Sept. — Xov. 



Trice 4. SENECIONIDJ2. 



38. PTER0CAITL0N, EH. Black-root. (Gr. nrepov, a wing, uavXov 

 a stem ; i. r.., a winged stem.) Heads many flowered, the fertile flow- 

 ers $ in several rows, the sterile flowers central ( ! ), mostly $ ; scales 

 imbricated, caducous with the fruit, $ corollas 3-toothed, « 5-cleft ; 

 achenia angular, hispid ; pappus of equal capillary bristles longer than 



