88 COMPOSITE. EuPATORiuM. 



pubescent, glandular ; achenia minutely glandular. — Linn. ! spec. 2. p. 837 ; 

 Willd.! spec. 2. p. 1751 ; Michx. ! fl. 2. p. 98 ,• Pursh I fl. 2. p. 613 ; 

 Ell. I. c. ; Bigel. fl. Bost. ed. 2. p. 295; Darlin,s;t. fl. Cest. p. 451 ; DC! 

 prodr. 5. p. 151. E. tnincatum, Ell. sk. 2. p. 298. 



Borders of thickets, Massachusetts ! New York ! Pennsylvania ! and 

 along the Alleghany Mountains to Georgia ! and Alabama ! Aug.-Sept. — 

 Stem 2-4 feet high, much branched above. Leaves often 6 inches long, 

 variable in breadth, and in the teeth (Avhich are either fine or coarse), gla- 

 brous. Heads, according to DeCandoUe, 5-12-flo\vered, but we have only 

 observed the smaller number. Lobes of the corolla ovate-lanceolate. Style 

 moderately exserted ; the base minutely bulbous and villous. 



16. E. ]7erfoUafM7n (Linn.) : stem stout, very pubescent or villous-hirsute, 

 corymbosely branched above ; leaves opposite, connate-perfoliate, divaricate, 

 lanceolate, elongated, tapering gradually from the base to the acuminate 

 apex, obtusely serrate, veiny, the veinlets reticulated beneath, rugose, pu- 

 bescent, the lower surface usually almost tomentose-pubescent and sprinkled 

 with resinous dots; corymb fastigiate, compound ; the heads commonly 10- 

 flowered ; scales of the involucre 12-15, very pubescent, glandular, imbri- 

 cated ; the inner ones linear-lanceolate, with scarious tips ; achenia glabrous 

 or minutely glandular. — Linn. ! spce. 2. p. 838 ; Willd.! spec. 3. p. 1761 ; 

 Pursh! I. c. ; Ell. sk. 2. p. 302; Bigel.! mcd. hot. 1. p. 38, t. 2, S^- fl. 

 Bost. cd. 2. p. 297 ; Raf. mcd. hot. t. 36 ; Darlinst. ! fl. Cest. p. 451 ; 

 Hook. fl. Bor.-Am. 1. p. 305 ; DC. ! prodr. 5. ;;». 15]". 



/?. leaves glabrous above, pubescent only on the midrib and veins of the 

 lower surface ; heads 25-40-flowered ! 



y. leaves glabrous above, more or less pubescent beneath ; the upper dis- 

 tinct and truncate at the base ; the uppemiost frequently alternate. — E. 

 truncatum, Muhl. in Willd. ! spec. 3. p. 1751 ; not of Ell., scarcely of 

 DC. E. salviajfolium. Bat. mag. t. 2010. 



6. smaller ; leaves mostly narrowed at the base, distinct or slightly con- 

 nate. — E. cuneatum, Engelmann! ?nss. 



Swampy grounds, Canada ! Upper Missouri ! and throughout the United 

 States ! abundant. 6. Arkansas, near Little Rock, Dr. Engelmann ! July- 

 Sept. — Stem 2-4 feet high. Leaves often 6-8 inches long, usually perfectly 

 connate at the base, where they are widest, decussate, rarely ternate and 

 connate in the same manner. Lobes of the corolla ovate, short. — This is the 

 well-known Boncsct or Thoroitgh-tcort, so universall)' employed in popular 

 medicine. Our var. /3. may be considered as an accidental state, produced 

 by the confluence of several heads into one, and the scales of the involucre 

 are likewise increased in number. The same thing we suspect sometimes 

 occurs in E. sessihfolium, and perhaps in other species. The E. truncatum 

 of Muhlenberg and Willdenow, according to herbarium of the latter, is noth- 

 ing more than a form of tins species with the u])per leaves disjoined and 

 smoother. 



18. E. resinosum (Torr.) : stem velvety-puberulent, simple, or corymbosely 

 branched at the summit ; leaves opposite, closely sessile or parti}' clasping 

 at the base, linear-lanceolate, elongated, spreading or divaricate, attenuate- 

 acuminate, evenly serrate, 1-nerved, pinnately veined, nearly glabrous 

 above, minutely velvety-canescent beneath, both surfaces glandular and 

 somewhat viscid with resinous globules ; corymb fastigiate, compound ; 

 heads glomerate, 10-15-flowered ; scales of the involucre oval, obtuse, im- 

 bricated, tomentose-canescent and glandular ; achenia minutely roughened 

 with dark resinous globules. — Torr.! in DC. 2>^odr 5. p. 176. 



Swamps and wet soil in the pine barrens of New Jersey, near Quaker 

 Bridge and Wading River! Also "Pennsylvania," Bartram ! (in herb. 

 Banks, under the name of E. canescens.) Aug.-Sept. — Stems terete, grow- 



