298 Class XIX. Order I. 



hollow throughout its whole length, its tube not being interrupted 

 by joints. Leaves in whorls of four, five, or six; ovate, rugged 

 with veins, acute. Flowers purple, in a large, branching, termi- 

 nal corymb. Calyx containing about eight florets, with very 

 long styles. August, September. Perennial. 



EUPATORIUM VERTICILLATUM. Mulil. Whorled Eupatorium. 



Leaves petioled, in whorls of three or four, ovate- 

 lanceolate, wedge shaped at base, unequally serrate, 

 smoothish ; stem solid, smooth. Wdld. 



Syn. EUPATORIUM PUSPUREUM. Mich. 



A very tall species, much resembling the last in habit. Stem 

 smooth, round. Leaves about four in a whorl, large and spread- 

 ing, serrate, the lower part entire, and tapering to the petiole- 

 Flowers in a large, terminal corymb. FloAvering branches also 

 proceed from the axils of the upper leaves. Calyx whitish. 

 Corollas purplish. Wet thickets. August, September. Peren- 

 nial. 



Between this and the foregoing there are several interme- 

 diate species, or more probably varieties. 



Submenus . Calyx simple. 



EUPATORIUM AGERATOIDES. Willd. Nettle leaved Eupatorium. 



Stem glabrous ; leaves on long petioles, subcordate- 

 ovate, acuminate, toothed, smoothish ; calyx about 

 twenty flowered. 



Syn. EUPATORIUM URTICIFOLIUM. MX. 



Stem round, smooth. Leaves opposite, the lower ones on 

 long petioles, sharply serrate, acuminate, somewhat hearted, 

 nearly smooth. Flowers numerous, small, white, in small pan- 

 icled corymbs or heads. Calyx mostly simple with from twenty 

 to thirty florets. About the base of the White mountains. Mr. 

 Little. August. 



EUPATORIUM AROMATICUM. Willd. Aromatic Eupatorium. 



Stem roughish ; leaves petioled, ovate, acute, ob- 

 tusely toothed, roughish ; calyx about twenty flow- 

 ered. 



