378 ORDER LXVIIT. COMPOSITE. 



alternate at the base. Pap>pus in 1 series of capillary bristles. 

 Herbaceous plants with alternate variously incised leaves. 

 Flowers white. 



1. C. sinua'ta, (Ell.) Stem hairy, somewhat scabrous; lower leaves 

 sinuate lobed, the upper huear, entire. Heads paniculate. — White. 

 If. Charleston. 



Genus XXVIIL— BAC'CHARIS. L. (From Bacchus.) 



Involucre imbricate, cylindric; scales sub-coriaceous, ovate. 

 Receptacle naked ; florets tubular, monoecious, with sterile and 

 fertile intermixed. Staminate florets with exserted anthers, 

 unawned at the base ; pappus slightly plumose. Fertile florets 

 with capillary pappus. Achenia ribbed. 



1. B. angustifo'lia, (Mich.) A shrub. Stem erect, glabrous, branch- 

 ing, young branches angled, dotted. Leaves sessile, entire, linear, ob- 

 scurely 3-nerved. Flowers in compound panicles, generally axillary, 

 solitary ; involucre slightly ventricose, with glabrous, ovate, lanceolate 

 leaflets; sterile florets tubular, white, with a short, undivided style; 

 fertile florets 5-cleft. Stamens wanting. Style 2-cleft. Seeds striate, 

 cylindric. — White. ^. Sept. — Oct. On the coast. 6 — 10 feet. 



2. B. halimifo'lia, (L.) A shrub, with erect branches, glabrous young 

 branches angled. Leaves sessile, obovate, cuneate, dentate toward the 

 summit, upper ones usually entire, covered with whitish scales or dust. 

 Flowers in leafy, compound panicles, axillary and terminal. Style of 

 the fertile florets 2-cleft, rather shorter than the stamens. Seeds stri- 

 ate, oblong. — White. £ . Sept. — Oct. Low country. 6 — 12 feet. 



3. B. sessiliflo'ka, (Mich.) A shrub, with angular, erect, virgate 

 branches, glabrous. Leaves nearly sessile, obovate, cuneate, dentate 

 toward the summit. Flowers sessile, axillary, scattered ; involucre with 

 obtuse scales, reddish at the summit. — White. ^ . Sept. — Oct. On 

 the seacoast. 3 — 5 feet. B. glomeruli flora, Pers. 



Genus XXIX.— PLU'CHEA. Cass. 



(From a French botanist, N. Pluche.) 



Heads many -flowered, all tubular, those of the margin pistil- 

 late and fertile, those of the center staminate or perfect, but 

 sterile. Involucre with the scales in many series. Receptacle 

 flat. Anthers bicaudate. Achenia cylindrical. Pappus in one 

 series, pilose. Herbaceous plants, with alternate leaves and 

 heads in corymbs. 



1. P. bifrons', (D. C.) Stem pubescent. Leaves clasping at the base, 

 somewhat cordate, oval or lanceolate, oblong, serrulate, sprinkled with 

 resinous dots. Heads in corymbs. — Purple. 2{. Car. — Flor. Low 

 country. 2 — 3 feet. 



2. P. fott'ida, (D. C.) Stem pubescent. Leaves petiolate, oval- 

 lanceolate, acuminate, feather-veined, serrate. Heads in paniculate, 

 compound corymbs. Fetid. — U. Penn. — Ala. 2— 4 feet 



