ROBINSON. — MEXICAN PLANTS. 329 



the scarcely paler under surface; petioles slender, 1.5 cm. long, purj^le : 

 heads small, crowded in round-topped corymbs at the ends of the 

 branches; pedicels and bracts filiform; scales of the involucre lineai-, 

 substriate, 2.5 mm. long, slightly ciliated near the acute tip : corollas 

 white, 3 mm. long, enlarged at the base of the tube, glabrous : achene 

 scarcely over 1 mm. long, black, glabrous ; pappus-bristles 5 to 8, often 

 5 one over each angle of the achene, unequal, white, caducous. — Col- 

 lected by E. A. Goldman near Batopilas, Chihuahua, Mexico, altitude 

 1,700 to 1,750 m., 4-5 October, 1898, no. 196. Readily distinguished 

 from the other species of the genus by its much broader and well- 

 petioled leaves. This may possibly prove identical with Eupatorlum 

 triangulatum, Alam., or E. rubrocaule^ HBK. 



An effort to secure a more accurate classification of the tropical Ameri- 

 can Eupatoriums represented in the Gray Herbarium has suggested the 

 publication of the following new species and specific reductions. The 

 writer hopes later to publish a synopsis of the Mexican and Central 

 American species and thereby show more clearly the affinities of the 

 forms here proposed. 



EuPATORiu.M ADENACHAENiUM, Sch. Bip. in Klatt, Leopoldina, xx. 

 75 (1884). Add syn. E. adenochaetum, Hemsl. Biol. Cent.-Am. Bot. ii. 

 91 (1881), nomen nudum. 



E. ADSPERSUM, Klatt, Bull. Soc. Bot. Belg. xxxv. 279. Add syn. 

 E. polanlhum, Klatt, 1. c. 281. It is impossible to detect differences of 

 any moment whatever. I doubt whether either is really distinct from 

 Dr. Klatt's earlier species E. anisochromum, Bull. Soc. Bot. Belg. xxxi. 

 186 (1892). 



E. aegirophyllum. Stem terete, clothed with close sordid or tawny 

 slightly scabrous tomentum ; internodes long: leaves opposite, ovate, 

 subrotund, shortly acuminate, shallowly and broadly cordate, 1.2 dm. 

 long, nearly or quite as broad, puberulent and slightly scabrous above, 

 much paler and at first tomentose but at length glabrate and veiny 

 beneath, serrulate (sometimes obsoletely so) ; nerves at base pinnate then 

 palmate somewhat above the base ; petioles tomentose, 5 to 7 cm. long : 

 inflorescence a large round-topped many-headed panicle ; branches oppo- 

 site, tomentose ; primary bracts petiolate, similar to the leaves ; the 

 secondary and ultimate ones linear or subulate ; heads 1 cm. long, 20- 

 30-flowered; involucral scales about 22, lance-linear, subequal, acute, 

 glandular-puberulent on the back, loosely imbricated: corollas 5 mm. 

 long, about equalling the whitish pappus ; the slender proper tube ex- 



