CLASS XIX. ORDER I. ' 317 



Syn. EuPATORiuM pukpureum. 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. Flowering 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 intermediate 

 species, or more probably varieties. 



§ Subgenus . Calyx simple. 



EuPATORiuM AGERATOiDES. WHlfL Nettle Icavcd Eupa- 



torium. 



Stem glabrous ; leaves on long petioles, subcordate- 

 ovate, acuminate, toothed, stnoothish ; calyx about 

 twenty flowered. 

 Syn. EtnPATORiUM urticifolium. Mx. 



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

 long petioles, sharply serrate, acuminate, somewhat hearted, 

 nearly smooth. Flowers numerous, small, while, in small pani- 

 cled corymbs or heads. Calyx mostly simple, with from twenty 

 to thirty florets. — About the base of the White mountains. Blr. 

 Little. — August. 



EuPATORiuM AROMATicuM. Wllld. AroDiatic Eupatorlum. 

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

 tusely toothed, roughish; calyx about twenty flow- 

 ered. 



A beautiful species with a small corymb of large, white, aro- 

 matic flowers. Compared with the preceding it has a rougher 

 stem, shorter petioles, leaves not sharply toothed nor acuminate, 

 flowers more than twice the size, but much fewer in number. — 

 Dry woods, Pvoxbury. — August. — Annual ? 

 27* 



