OBEBR 70. COMPOSITE. 439 



6f high, furrowed, branching, and downy above. Radical Ivs. 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. 

 JL, Aug. 



34. PLITCHEA, DC. MAIISH FLEA-BANE. Heads many-flowered, 



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

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

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

 purple fls., and copious, reddish pappus. 



1 P. camphorata DC. Lvs. ovate-lanceolate, somewhat pubescent, acute, ses- 

 sile or sJiorl-petioled, serrate, serratures 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 Ivs. and axillary branches. Fls. light purple. 

 Aug. (Couyza camphorata Muhl. C. Marilandica MX.) 



2 P. foetida DC. Erect, nearly glabrous, very leafy; Ivs. 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. Lva. 

 4 7' by 1J 3', sprinkled with minute dots; petioles $ 1' long. Hds. numer- 

 ous. Aug. Oct. (Baccharis, L. Conyza camphorata Ph.) 



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

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

 S. Car. to Fla. and La. Sts. 1 to 3f high, strict. Lvs. 2 to 3' long, 1' wide. Fla 

 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^ 

 direcious ; involucre imbricate, cylindric, or ovate, with subcoriaceons, 

 ovate scales ; sterile flowers with the stamens exserted ; receptacle 

 naked ; pappus capillary. Shrubby plants, with alternate Ivs. and 

 white fls. 



1 B halimifolia L. Glabrous, whitish-scurfy ; Ivs. oTxvrfe, incisety dentate above, 

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

 a dense panicle. Ct., N. Y. to Ga. An elegant shrub, 8 to 12f high, growing on 

 sea-coast and river alluvion. Every part is covered with white dust. The fertilw 

 hds. growing upon separate plants are in large, loose, terminal panicles, and fur* 

 nished with very long, slender pappus. Cor. white, 20 in each head. Sept.^- 

 Merits cultivation. 



2 B. angustifolia MX. Glabrous, diffusely branched; Ivs. linear, sessile, entire ; 

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

 Fla., and La., in the edge of salt marshes. A fine shrub, 6 to lOf high, witfo 

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

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



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

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

 axils of the upper Ivs. Va. to Fla. and La., along the coast St. 3 to of high, 

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

 larger (3" long and wide) than in No. 1. Sept. Nov. 



TRIBE 4. SENECIOXIDJE. 



36. PTEROCAITLON, Ell. BLACK-ROOT. (Gr. Trrepov, a wing, Kav/.6v 

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

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

 .imbricated, caducous with tlie fruit, $ corollas 3-toothed, > 5-cleft; 

 acheiiia angular, hispid ; pappus of equal capillary brist'.cs longer that* 



