OEEER 70. COMPOSITES. 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. MARSH 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 ot' 

 purple fls., and copious, reddish pappus. 



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

 sile or short-petioled, serrate, serratures mucronate ; fls. in crowded corymbs. If 

 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. (Conyza 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. Lvs. 

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

 ous. A'ug. 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 Sfhigh, strict Lvs. 2 to 3' 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 Ivs. and 

 white fls. 



1 B. halimifolia L. Glabrous, whitish-scurfy; Ivs. obova'e, 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 12f high, growing on 

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

 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, with 

 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 glomerules, in tJie 

 axils of the ujrper Ivs. 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, as wide. Hds. thrice 

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



TRIBE 4. SENECIONIDJE. 



36. PTEROCAU'LON, Ell. BLACK-ROOT. (Gr. Trrfyov, a wing, 

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

 ers $ in several rows, the sterile flowers central ( ! ), mostly 5 scale? 

 imbricated, caducous with the fruit, 9 corollas 3 -toothed, $ 5-cleft ; 

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



