186 New Species of Mexican Plants. [ZOE 
ing the calyx, 5-lobed; lobes subrotund: ovary glabrous: styles 
essentially equal, 0,5 mm. or less in length, glabrous, more or less 
persistent: capsule oblong, about 2.5 mm. long, glabrous, many- 
seeded.—MExico. State of Coahuila: in sandy soil, Pefia, 1903, 
C. A. Purpus, No. 124 (hb. Gr., hb. Brandg. ). 
Eupatorium rivale. Stem terete, puberulent: leaves opposite, 
petiolate, ovate, 7 to 11 cm, long, 5 to 8 cm. broad, acuminate, 
acute, unequally crenate-dentate, cordate, puberulent above, pu- 
bescent on the nerves and veins beneath and bearing here and 
there on the under surface patches of tomentum, 3-5-nerved from 
the base; petioles 3 to 5.5 cm. long: heads 8 to ro mm. high, dis- 
posed in finely pubescent axillary corymbs together forming an 
elongated leafy panicle: peduncles slender: involucre narrowly 
cainpanulate, shorter than the 2 5 to 30 flowers; bracts of the in- 
volucre 2-3-seriate, subequal or the outermost shorter, striate, 
slightly pubescent: corollas white: Pappus of uniform sete, 
white: mature achenes 2 mm. long, pubescent on the angles.— 
MExIco. State of Mexico: Mt. Ixtaccihuatl, altitude 21 50 to 
2460 m., 1903, C. 4. Purpus, No. 213 (hb. Gr., and hb. Brandg.). 
In general aspect E. rivale resembles £. petiolare, Mog., but is 
readily distinguished from it by having the leaves only sparingly 
pubescent beneath, smaller and fewer-flowered heads, and the 
corolla-lobes externally pilose-pubescent, 
Eupatorium vernicosum, Schz. Bip. in herb. Shrub: stem 
much-branched; ultimate branchlets as well as the foliage and in- 
florescence glutinous: leaves Opposite, petiolate, ovate, 2 to 5.5 
em. long, 2 to 4.5 cm. broad, acute or short-acuminate, dentate, 
cordate at the base, glabrous on both surfaces; petioles 1 to 2.5 
cm. long: inflorescence few-headed cymes, terminating the stem 
and branches; peduncles 1 to 3 cm, long: heads 1.5 cm, high, 40- 
50-flowered: involucre 3-seriate; bracts of the involucre lance- 
olate, To to 13 mm. long, acute, subequal or the outermost shorter, 
of unequal sete; corollas white or roseate: mature achene 
long, pubescent, pentagonal in cross-section.—MExIco, State of 
Mexico: rocks near timber line, Mt. Ixtaccihuatl, altitude 3350 to 
3650 m., 1903, C. A. Purpus, No. 180 (hb. Gr., hb. Brandg.). 
