452 S YNGENESI A [ Eupatohiack* 



E. urticsefolium. Mx. Am. 2. p. 100. Not of Will J. Ait. Per*. 

 LindL &c 



AgERATUM-LIKE EuPATORIUM. 



Root perennial. Stem 2 to 3 feet high, somewhat branched, smooth, the summit 

 and branches pubescent- Leaves 2 to 4 or 5 inches long, and 1 to 3 inches wide 

 OTatc, acuminate, coarsely and rather sharply serrate, the base dilated, obtuse and 

 often almost truncate, sometimes abruptly tapering to the petiole, thin, membran- 

 aceous, and shining, 3-nerved, sparingly pilose, and ciliate ; petioles half an inch 

 to 2 or 2 and a half inches long. Heads of flowers in terminal cymose corymbs ; 

 pedicels pubescent, with filiform-subulate bracts at base ; involucres usually 12 to 

 15 flowered, simple, the leaflets nearly equal, linear-oblong, rather obtuse, slightly 

 pubescent, scarious on the margin, and finely ciliate. Florets very white. 



Hub. Moist woodlands, and thickets: frequent. Ft. Aug— Sept. Fr. Sept— Octo. 



6. E. aromaticum ! L. Stem roughish-pubesccnt ; leaves lance* 

 ovate, acute, rather obtusely serrate, roughish, and slightly rugose-vein- 

 ed, on short petioles ; involucre sub-simple, pubescent. Beck, Bat. 

 p. 198. 



Also, E. melissoides. Florul. Cestr.p.86. Not? of mild. &c. 



Aromatic Eupatorium. 



Root perennial ? (annual ? BigeL). Stem 18 inches to 2 feet high, subsimplc, or 

 corymbose at summit, more or less pubescent. Leaves an inch and half to 3 or 

 4 inches long, and 3 fourths of an inch to 2 inches wide, lance-ovate, or oblong- 

 ovate, acute but scarcely acuminate, obtuse at base (the lower ones often sub-cop 

 date), 3-nerved, reticulately veined, subrugose, and rather scabrous ; petioles I 

 fourth of an inch to near an inch long. Heads of flowers in small erect corymbs ; 

 pedicels very pubescent, with subulate bracts at base ; involucres 8 to 20-flowered> 

 a miewhat imbricated, the leaflets nearly equal, lance-linear, pubescent and cili- 

 ate. Florets very white, rather larger than the preceding. 

 Hob. Rocky banks; thickets and clearings: frequent. Fl. Aug-Sept. Fr. Sept-Octo. 



Obs. This is somewhat variable— but has considerable general resemblanco to 

 the preceding ; and, as it is usually found in poorer soils, and on dry rocky banks, 

 may be readily mistaken for starved specimens of it. I have a suspicion that E. 

 melissoides, and E. ccanothifolium, of Authors, are scarcely more than varieties 

 of this. 



•j* j- Florets purple. 



7. E. cgblestinuk, L. Leaves lance-ovate, or deltoid-oblong, obtusely 

 •errate, roughish-pubesccnt, petiolate ; involucre imbricated ; receptacle 

 oonic. Ell. Sk. 2. p. 306. 



Cndestina cserulea. Less. Syn. p. 155. Beck, Bot. p. 198. 



Also ? C. ageratoides. LindL Ency. p. 690. 



Also {fide Lessing. ), Ageratum corymbosum. Pers. Syn. 2. p. 402. 



Celestial, or Blue Eupatorium. 



Root perennial. Stem 18 inches to 2 or 3 feet high, terete, firm, scabrous-pubes- 

 cent, branching. Leaves an inch and half to 3 or 4 inches long, and 3 fourths of 

 an inch to 2 inches wide, obtuse at baae, tapering to the apex, 3-nerved, somewhat 

 rugose, scabrous-pubescent, especially on the nerves beneath ; petioles 1 fourth of 

 an inch to an inch long, pubescent. Heads of flowers In rather dense cymose co 

 rymbs; psdiosls with filiform-subulate bracts at base ; involucres many-flowered 



