358 ORDER Lxvni. COMPOSITE. 



elongated ; pappus setaceous, pale purple, persistent. Flowers 

 pale purple. Herbaceous plant, with opposite, 3-nerved leaves 

 and corymbose heads. 



1. B. cordifo'lia, (Ell.) Stem simple, pubescent, corymbose at the 

 summit. Leaves opposite, cordate, dentate, finely pubescent ; branches 

 of the style much exserted. — Pale purple. If. Western Geo. and 

 Florida. 3 feet. 



Genus XL— EUPATO'RIUM. Tourn. 

 (From Eupator, King of Pontus.) 



Involucre cylindrical, imbricate, campanulate, scales. Florets 

 all perfect, tubular, 5-toothed. Style long, deeply cleft. Re- 

 ceptacle naked. Seed glabrous, 5 -striate or angled. Pappus 

 plumose, usually scabrous. 



a. Involucre 3 — 5-Jlowered. 



1. E. fcenicula'ceum, (L.) Stein striate, finely pubescent, with pa- 

 niculate branches ; lower leaves compoundly pinnate, with filiform seg- 

 ments, glabrous, furrowed on the upper surface ; the upper ones seta- 

 ceous, in clusters. Flowers in compound erect panicles, very small and 

 very numerous ; involucre with 5 interior equal leaves, and 5 small 

 exterior ones, all pubescent. Seeds cylindrical ; receptacle naked. — 

 Yellowish- white. If. Sept. — Oct. Very abundant. 3 — 10 feet. - 



2. E. coronopifo'lium, (L.) Stem erect, pubescent, paniculately 

 branched ; lower leaves pinnatifid, with 5 — 7 linear-lanceolate seg- 

 ments, denticulate ; upper leaves linear, clustered, all pubescent. Flow- 

 ers in compound panicles; involucre with 8 — 10 unequal, pubescent 

 leaves. Seed glabrous, pappus scabrous. — White. If. Sept. — Oct. 

 Poor soils. Common. 3 — 4 feet. 



3. E. pinnatif'idum, (Ell.) Stem erect, striate, pubescent, branching, 

 with the branches pubescent ; lower leaves pinnatifid, verticillate, with 

 linear segments, pubescent; upper leaves generally alternate. Flowers 

 in fastigiate corymbs; involucre 8 — 10-leaved, with glandular dots on 

 the back. Seed oblong, deeply striate ; pappus scabrous. — White. If . 

 Sept. — Oct. Damp soils. 3 — 4 feet. 



4. E. unearifo'lium, (Walt.) Stem usually procumbent, very pu- 

 bescent toward the summit, branching. Leaves sessile, pubescent, lin- 

 ear-lanceolate, with clusters of small leaves at the axil. Floivers in 

 irregular corymbs ; involucre with 10 linear villous leaves, glandular 

 on thr outer surface. Seed deeply striate, pappus scabrous. — White. 

 2f. Aug. — Sept. Dry soils. Common. 1 — 2 feet. 



5. E. hyssopifo'liu.m, (L.) Stan erect, pubescent. Leaves sessile, 

 the lower ones linear-lanceolate, opposite, somewhat toothed, upper 

 ones alternate, pubescent, with clusters of small leaves in the axils. 

 Flowers in terminal corymbs; involucre 10-leaved, sprinkled with 

 glandular dots, purplish at the summit. Seed furrowed, glandular; 

 pappus scabrous. — White. 2f . Sept. — Oct. Very common. 2 — 3 ft. 



6. E. gi.ai'i k'oknb, (EU.) Stem erect, pubescent, Leaves broad- 

 lanceolate, slightly serrate toward the summit, 3-nerved, pubescent, 

 with a pair of small leaves in the axil. Leaves of the branches usually 

 alternate, small, glaucous. Flowers in corymbs; involucre with 8 — 10 



