COMPOSITE. 159 



7. EUPATORIUM. Tuurn. Thorough wort. 



Dedicated to Evpalor MOhridaies, who is said to have Used a species of the gram 

 in medicine. 



Heads 3-many-flowered. Involucre cylindrical or bellr 



shaped. Receptacle flat, naked. Corolla 5-toothed. 

 Pappus simple, a single row of slender capillary longish 

 bristles. ACHENIA 5-angled. — Perennial Herbs, icith oppo- 

 site or vcrticillatc leaves, corymbose heads, and flowers white % 

 blue, red, dr., never yellow. 



1. E. PURPUREUM, L. Trumpet-wred. 



Stem tall and stout, simple; leaves 3 to G in a whorl, oblong-ovate or lanceolate, 

 pointed, very yeiiry, roughish, finely glandular serrate; cerym&svery dense arid 

 compound with vhorled peduncle?. 



Low ground.-; cronmon. July— Sept. flfem 6 to 12 foot high, smooth glaueon* 

 pur] le, striate or fistular spotted or unspotted-. Leaves in about 12 Whorls of 3 to 

 Gs, largest in the middle of the stew, S inches long, and 2 wide, on petioles 1 inch 

 long. Cbrymbs often 1 foot in diameter, 1 lowers purple, showy. 



* Heads 5 in 2~>./< ' • mor? Gr ?ess imlricalcd and unequal 



■cafes; /lowers white; kaie; mostly epposite, sessile or nearly so; heads tnosUy 

 b-flower 



2. E. HYSOPltfOLTUM, L. Narrow -leaved Thorouglucort. 



Minutely pubescent; leave; opposite (the upper ones alternate) often vhorled, 

 narrow, linear or lanceolate, 1 to 3-nerved, lower ones suh- 



serratc, upper ones entir ■ : seal % ■ j I '« lucre obtuse. 



Dry fields and sterile soil. Aug., Sept. S cm 1 to 2 feet high, branching, with 

 numerous nam n leaves. Corymb spreading at the summit. Heads 5-tloveoad. 

 Flowers purplish. 



3. E. altissimum, L. Fall Thorouijliicort. 



(Rem tall and stout, pubescent; leaves lanceolate, tapering at both ends, suV 

 sessile, acutely serrata above the middle, conspicuously 3-nerved; corymbs nume> 

 on*, dense; heads 5 flowered; Kales 8 to 12, obtuse, shorter than the flowers. 



Wends and randy Foil. SRem 3 to 7 feet high. Leaves 3 to 4 inches 



long, y, to '■}:{ wide, small ones often fascicled iu the axils. Corollas whitish, mxich 

 longer than the scales. 



4. E. album, L. White-flowered Thoroughwort 



Slcm pubescent: leaves ovate-lanceolate, coarsely toothed, veiny : foaefs clustered 

 in the corymb, 5-flowered'; scales of the involucre closely imbricated, rigid, narrow, 

 point d, white and sc:. i us above. 



Sandy and barren places. Aug. — Oct. Stem, 2 to 3 inches long, % to 1 wide, 

 Upper ones entire and alternate. Heads very white. Involucre concealing the 

 flowers, sprinkled with resinous dots. 



5. E. TEUCRIFOLIUM, Willd. Verve in-leaved Thoro' wort 

 Itoughish-pulcsccnt; leaves opposite, sessile, ovate-oblong and ovate-lanceolate, 



rough, veiny, coarsely toothed towards the base, upper ones alternate ; corymb 

 compound, somewhat panieled with few \ ranches; heads 5 to G-Cowered; scales of 

 the mv lucre 10, oblong lanceolate, rather obtuse': 



Low grounds. Aug.— Oct. Stan 2 to 3 feet high, erect, rather slender. L*avt* 

 sometimes almost incised : the lower broad at base and closely sessile. Heads 

 somewhat clust< red, corymbose. Flowers white. Scales scarious on the margin, 

 White at the tips. 



