ROBINSON, — MEXICAN PLANTS. 329 
the scarcely paler under surface; petioles slender, 1.5 em. long, purple: 
heads small, crowded in round-topped corymbs at the ends of the 
branches; pedicels and bracts filiform; scales of the involucre linear, 
substriate, 2.6 mm. long, slightly ciliated near the acute tip: corollas 
white, 8 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 Zupatorium 
triangulatum, Alam., or E. rubrocaule, UBK. 
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. 
Evratorium ApENACHAENIUM, Sch. Bip. in Klatt, Leopoldina, xx. 
75 (1884). Add syn, Z. adenochaetum, Hemsl. Biol. Cent.-Am. Bot. ii. 
91 (1881), nomen nudum. 
E. apsrersum, Klatt, Bull. Soc. Bot. Belg. xxxv. 279. Add syn. 
E. polanthum, 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 HZ. 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 em. 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- 
