EUPATORIACB^. 1^ 



original one, to take names as follows : all having been named 

 under Eupaiorium by the authors indicated : T. compositi- 

 FOLiA ("Walt. Carol. 199), pinnatifida (Ell. Sk. ii. 295), lep- 

 TOPHYLLA (DC. Prodr. v. 176), Eugbnei and pectinata (Small. 

 PI. 1165). 



By far the greater proportion of the United States Eupatoria 

 belong to a group of herbaceous perennials with opposite leaves, 

 and white flowers in sessile terminal compound corymbs ; the 

 involucral bracts quite as few as in Kyrstenia, even fewer, but 

 in two or more very unequal series, the individual bracts of firm 

 texture, not ribbed or obviously nerved, obtuse or acute, often 

 white-margined or even scarious-tipped. The corollas are 

 small, consisting of a short tiibe and equally short, narrow fun- 

 nelf orm throat or limb, the color always white ; style-branches 

 not short, notably clavellate. Both involucres and achenes apt 

 to be strongly gland-dotted ; the fine white pappus-bristles 

 from scabrous to barbellulate. 



Of this assemblage I take E. perfoliatum, Linn., to be about 

 the oldest type, and name the genus Ustcasia, transferring to 

 it by name the following : U. pbrfoliata (Linn. Sp. 838), 

 TRUNCATA (Muhl. in Willd., Sp. iii, 1751), cuneata (Engelm. 

 in Torr. & Gray, ii, 88), sbssilifolia (Linn. Sp. 837), altissi- 

 MA (Linn. Sp. 837), kotundifolia (Linn. Sp. 837), scabrida 

 BU, Sk. ii, 298), PUBBSCBifs (Muhl. in Willd. Sp. iii, 1755), 



SBMISBRRATA (DC. Prodr. V. 177), OUNBIFOLIA Willd. 1. c. 



1753), HYSSOPiFOLiA (Linn. Sp. 836), tortifolia (Chapm. 

 Bot. Gaz. iii, 5), linbarifolia (Walt. Carol. 199), lechbjE- 

 FOLiA (Greene, Pitt, iii, 177), Torrbyaka (Short, Supplem. 5), 

 LBUOOLEPis (Torr. & Gray, Fl. ii, 84), alba (Linn. Mant. Ill), 

 PBTALOiDEA (Britt. Bull. Torr. Club, xxiv, 492), verbbkjEfolia 

 (Michx. Fl. ii, 98), akomala (Nash, Bull. Torr. Club, xxiii, 106), 

 MoHRii (Greene, contr. U. S. Herb, vi, 762), rbsinosa (Torr., 

 DC. Prodr. v. 176), mikanioidbs (Chapm. El. 195). 



With the exception of U. serotina, which ranges southward 

 into Mexico, I have not seen any Mexican Eupatoria that are of 

 this genus; but in South America there seem to be a number 

 of species ; U. glomerata and pallbscens (DC. Prodr. v- 

 154) for mere examples, and, for one that in aspect recalls 

 U.perfoliata, U. SALVIA (Colla). 



