Orber to.— composite. 439 



6f high, farrowed, branching, and downy above. Kadioal Its. very large (1 to 3f by 

 S 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 expectoraot. 

 ■11, Aug. § 



34. PLUXHEA, 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 of 

 purple fls., and copious, reddish pappus. 



1 P. campborata DC. I/us. ovate-lanceolate, somewhat pubescent, acute, ses- 

 sile or sTu>rt-pstu)led, serrate, serratures mucrouate ; fls. in crowded corymbs. — If 

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

 high, tliiok, downy, with alternate Ivs. and axillary branches. Fls. light purple. 

 Aug. (Oonyza caraphorata Muhl. C. Marilandica Mx.) 



2 P. foStida 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 IJ — 3', sprinkled with minute dots; petioles^ — 1' long. Hds. numei^ 

 ous. Aug. — Oct. (Baocharis, L. Conyza campborata Ph.) 



3 P. bifroos DC. Pubescent, leafy ; Ivs. 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. Fls. 

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



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

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

 dioecious ; involucre imbricate, cyliudric, 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. ohona'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, G (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 panicle^ and fur- 

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

 Merits cultivation. 



2 B. angustifdlia Mx. Glabrous, diffusely branched ; Ivs. linear, sessile, entire; 

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

 Fla., and La., in the edge of salt marshes.- A fine shrub, G 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. glomerulifldra Pers. Glabrous, minutely scurfy ; lvs. all ohovate tapering 

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

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

 palo 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. SENECIONID.^ 



36. PTEROCAU'LON, Ell. Black-root. (Gr. TrTt'poi', a wing, kw;^!' 

 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 the fruit, ? corollas 3-toothed, ti 5-cleft ; 

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



