Obbbr to.— COMPOSITjE. 439 



6f high, flirro'wed, 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 tonio and expectorant. 

 Jl., Aug. § 



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

 those of the margin ? , of the center g , 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. camphor^ta DC. Lvs. ovate-lanceolate, somewhat pubescent, acute, ses- 

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

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

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

 Aug. (Oouyza camphorata Muhl. C. Marilandica Mx.) 



2 P. foetida DO. 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 IJ — 3', sprinkled with minute dots; petioles^ — 1' long. Hds. numer- 

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



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

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

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

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



35. BACCHARIS, L. Groundsel Tree. (From Bacchus, wine ; 

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

 dicecious ; 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 B. halitnifdlia L. Glabrous, whiiish-sciafy ; hs. ohova% incisely dentate above, 

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

 a dense panicle. — Gt, iS. Y. to Ga. An elegant shrub, 6 to ISC 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 eacli head. Sept. — 

 Merits cultivation. 



2 B. aiigustif olia Mx. Glabrous, diffusely branched ; lvs. 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 ; lvs..aU obovate tapering 

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

 axils of the upper , lvs. — Ta. to Pla. 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 

 &,rger (3" long and wide) than in No. 1. Sept. — ^N"ov. 



Tribe 4. SENECIONIDJE. 



36. PTEROCAU^LON, 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 ij ; scales 

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

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



