94 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



branched, leafy, corymbose panicle; branchlets and pedicels rigid, 

 striate, puberulent. Heads about 20 flowered, 9-10 mm. high, 3-3.5 



mm. broad. Involucre cylindri- 

 cal bracts in 4-6 series, ap- 

 pressed, oblong, obtuse or api- 

 culate, several nerved, ciliolate 

 at the summit. Corolla pale 

 blue or white. Receptacle con- 

 vex to clavate. Achene black, 

 .6-. 65x4-5 mm., oblong, nar- 

 rowed at the base; in section 

 unequally 5 angled; 5 nerved 

 (often 3 or 4 nerved by suppres- 

 sion of the dorsal nerves), hirsute 

 on the nerves, a few scattered 

 hairs in the internerves above; 

 pappus bristles tawny, 3-5 mm. 

 long. ' 



Hab. Suburbs of Merida, 



Dec., 1864, Schott 144; "in brushlands, about Izamal, Oct.," Gaunter 

 914; "ascending 15 feet among shrubs and on old fences, flowers 

 heliotrope, Izamal, Oct.," 953; San Anselmo 2048; Chichankanab 

 2049, 2089; Calotmul 2087; Silam 2088; Xcholac, Stone 227; campo 

 about ruins, Chichen Itza, Jan. 17, 1895, Millspaugh Armour Exped. 

 115; old fields near San Miguel, Cozumel, Millspaiigh PI. Utowana 

 1489; in the arid stony scrubland south of Progreso, March 5, 1688 

 (Eupatorium ivafolium, Field Col. Mus. Bot. 2:105); old henequen 

 plantation near Merida, Feb. n, 1903, C&c. et Ed. Seler 3832. 



A variable species. Gaumer 953 ^ 2087, 2088, 2089, and Millspaugh 

 PL Utowance 1688 are diffusely branching plants with small corymbs,, 

 heads and achenes, and leaves 

 little or not at all punctate be- 

 low; Millspaugh PL Utowanx 

 1489 has corymbs, heads and 

 achenes unusually large, and in 

 appearance resembles Eupato- 

 rium odoratum L. 



Called XTOKABAL* "astrin- 

 gent" by the Mayas. 



Eupatorium pycnocephalum 



Less. Linnsea, 6:404. 

 An erect, slender, perennial 

 herb, with terete, glabrate or 

 puberulent stems and branches, 

 and opposite, petioled, deltoid-ovate or subcordate, acuminate, ere- 

 nate-dentate, soft pubescent leaves. Inflorescence of dense cymes 



*The Maya X denotes the feminine gender. It is here prefixed to Tokabal (Trixis frutescens) , but 

 whether this is simply to differentiate the plants, or whether it denotes that this species is used irt 

 the treatment of females, I cannot say. 



