OF ARTS AND SCIENCES. 27 



lanceolatis ; cymis corymbiformibus polycephalis laxis ; pcdiccllis fili- 

 formibus; capitulis 25-30-floris ; involucro canipanulato (lin. 4 longo) 

 pluriseriali, bracteis gradatim irnbricatis papyraceis 3-5-nervatis ob- 

 tusissimis prater extimas brevissimas glanduloso-pubentes glaberrimis 

 roseo-tinctis ovalibus oblongis, intimis linearibua ; corollis stylisque 

 elongatis rubellis ; aclieniis glabriusculis ; pappo albo deciduo. — On the 

 eastern side of the mountains east of San Luis Potosi. No. 1082. A 

 striking species; the tall and branching stems forming large clumps, 

 and the very numerous rose-colored heads ornamental. The recepta- 

 cle is plane and glabrous. Leaves copiously resinoso-atomiferous 

 beneath and puberulent; the upper cauline five or more inches in length. 



Eupatorium Mendezii, DC? Var. acuminatissimum. Pube 

 potius tomentella ; foliis plerumque sensim caudato-acuminatis ; aclie- 

 niis secus costas hispidulis. — No. 340. The very numerous and 

 paniculate heads are only 3 lines long, shorter than those of E. stillin- 

 gicefulium, the flowers smaller, and the corolla white. I have no 

 specimens of E. Mendezii; and this is perhaps a wholly distinct 

 species. 



Eupatorium scorodonioides. Eximbricata, fruticosum, canes- 

 cens ; foliis oppositis deltoideo-subcordatis nunc cordatis crenatis 

 petiolatis basi 3-5-nerviis subtus rugoso-venosis albido-tomentosis supra 

 puberulo-velutinis (pollicaribus, superioribus semipollicaribus) ; cymis 

 corymbiformibus oligocephalis ; capitulis omnibus pedicellatis ; involu- 

 cro 20-40-floro subuniseriali e bracteis lanceolato-liuearibus acutis ; 

 pappo corollam albam suba?quante. — Rocky hills near San Luis 

 Potosi, May and June. No. 336. Heads 5 and the involucre 3 line? 

 long. Corolla with rather large ovate-lanceolate lobes. A branching 

 shrub, only a foot or two high ; in two forms, one with small leaves, the 

 other with larger and more flaccid leaves, perhaps growing in shade. 



Eupatorium porphyranthemum. Subimbricata, glabellum ; caule 

 herbaceo laxo 1-2-pedali ; foliis oppositis longe petiolatis membranaceis 

 rhombico-ovato-lanceolatis seu e basi lato-cuneata ovato-acuminatis 

 grosse serratis triplinerviis ; cymulis oligocephalis in pedunculo nudo 

 laxe corymboso-cymosis ; capitulis omnibus pedicellatis 20-floris ; 

 involucro canipanulato (lin. 3 longo) gradatim laxe imbricato triseriali 

 glabro viridulo, bracteis omnibus obtusis binerviis, extimis paucis brevi- 

 bus ovalibus, ceteris oblongo-linearibus, intimis apice ssepius purpura- 

 tis ; corollis roseo-purpureis ; aclieniis ad costas hirtellis. — Between 

 San Luis Potosi and Tampico, at the eastern base of the mountains, 

 Palmer. No. 1083. Belongs to the group of E. pycnocrphulum, 

 Less., the E. Schiedeanum of Schrader, &c. Receptacle plane. 



