158 composite:. 



tusely dentate, 3-nerved, somewhat scabrous ; flowers in crowded corymbs, 

 CcelesLina cocrulea Spreng. Eupatorium ccelestinuvi Linn. 



Woods. Perm, to Car. W. to Miss. Aug.— Oct. %.—Stem 2—3 feet high. 

 Leaves on petioles, opposite, sometimes deUoid. Flowers in clotje fastigiate co- 

 rymbs, fragrant, light-blue. Involucre about 30-leaved, 40 — 60-flowered. 



Blue Conoclidium. 



7. EUPATORIUM. Linn.—Uem^weed. 

 (Named after Eupator, king of Pontus.)' 

 Heads 3- many-flowered. Receptacle flat, naked. Involu- 

 cre cylindric or campanulate ; the scales in i, 2 or many 

 series. Corolla tubular, funnel-form, often dilated at base. 

 Anthers included. Achenia angled. Pappus in a single series, 

 pilose, rough. 



* Heads 5 — Ib-jlowered. Scales of the involucre oblong, imbricate. Leaves 

 opposite, closely sessile or connate. 



1. E. sessilifolium Linn. : stem somewhat terete, smoothish ; leaves lan- 

 ceolate or ovate-lanceolate, sessile or somewhat clasping, rounded at base, 

 acuminate, serrate, smooth ; corymb compound ; heads 5-flowered ; scales 

 of the involucre 10, oblong-Unear, obtuse, imbricate. 



Rocky hills. Mass. to Geor. Aug. , Sept. %. — Stem 2 — 4 feet high, much 

 branched above. Leaves opposite but not connate, minutely dotted beneath. 

 Flowers in a widely spreading terminal corymb, white. 



Sessile-leaved Hempweed. 



2. E. truncatum Muhl. : stem terete, striate, villous-hispid ; leaves lan- 

 ceolate, clasping, obtuse at base, acuminate, rugose, dentate-serrate, villous- 

 pubescent beneath; corymb compound, crowded; heads 5 — lO-flowered; 

 scales of the involucre 12 — 15, imbricate, linear, obtuse. 



Shady woods. Penn. to Car. July— Sept. %.. — Very similar to the pre- 

 ceding, but has the stem pubescent, the leaves truncate at base, with the serra- 

 tures larger and more obtuse, and the involucre rtxore pubescent. Willd. 



Truncate-leaved Hempweed. 



3. E. pcrjoliatnm Linn. : stem villous-hirsute ; leaves connate-perfoliate, 

 lanceolate-oblong, acuminate, crenate-serrate, rugose, tomentose beneath ; 

 corymb compound ; heads 8 — lO-flowered. E . connalnm Mich. 



Swampy grounds. Can. to Flor. W. to Miss. Aug., Sept. %.—Stem 2—4 

 feet high, hairy or woolly, branched at the top. Leaves large, sometimes only 

 slightly connate. Flowers in large fastigiate corymbs, white. The whole plajit 

 is bitter and is used as a tonic. Big. Med. Bat. i. 33. 



Boneset. Thoroughwort. 



4. E. resinosnm Toit. ; stem erect, velvety pubescent ; leaves opposite, 

 closely sessile or partly clasping at base, linear-lanceolate, elongated, acu- 

 minate, serrate, nearly smooth above, velvety canescent beneath ; corymb 

 fastigiate, compound ; heads glomerate, 10 — 15-flowered ; scales of the in- 

 volucre oval, obtuse, imbricate, white-tomentose and glandular. 



Swamps. N. Y. and N. J. Penn. ? Aug., Sept. %.— Stems growing in 

 tufts, 2—3 feet high. Leaves membranaceous, viscid with resinous globules. 

 Heads rather small, very numerous. Resinous Hempweed. 



