42 PROCEEDINGS OF THE AMERICAN ACADEMY. 
light colored, yellowish, highly polished and shining, half line or less in 
diameter. — Collected by C. G. Pringle in open glades, Sierra de San 
Felipe, Oaxaca, altitude 8,000 feet, June, 1894, no. 4692. Habit of 
Houstonia purpurea, var. tenuifolia. 
Eupatorium eriocarpum. Stem tall, 5 to 8 feet in height; 
branches glabrate, angled, lucid, yellowish brown; branchlets puberulent 
but soon glabrate: leaves opposite, ovate or rhombic ovate, crenate- 
serrate, acuminate to an obtusish apex, cuneate or rather abruptly con- 
tracted at the mostly unequal-sided base, glabrous on both surfaces except 
on the veins and at their axils, 2 to 3 inches in length, a third to half as 
broad, neither coriaceous nor rugose, scarcely paler beneath, pinnately 
veined; petioles 2 to 3 lines long: thyrsoid inflorescences terminal on 
the upper branchlets and together forming large ovate leafy panicles; 
slender peduncles and short pedicels often nodding, covered with fine 
and somewhat sordid pubescence: heads mostly 5-flowered, 5 to 6 lines 
in length: scales of the involucre ovate to ovate-oblong, obtuse, finely 
striate, ciliolate, imbricated in 3 or 4 series: corolla-tube slender, 2} 
lines in length, larger at the base than at the summit, without any ap- 
parent throat; teeth very short: style branches dark colored, strongly 
clavate: achenes turbinate, so densely covered with white woolly or silky 
pubescence as to obscure their 5 angles, about 2 lines in length, narrowed 
at the base to a glabrous callous and somewhat pungent lip; pappus- 
bristles white, slightly exceeding the achene, about 50 in number. — 
Collected by C. G. Pringle, in Tomellin Cafion, Oaxaca, altitude 3,000 
feet, 22 December, 1894, no. 6112. 
Eupatorium rupicola. Shrub, 5 to 10 feet in height: branchlets 
reddish brown, terete, finely and densely fuscous-puberulent: leaves Op- 
posite, petiolate, ovate, acuminate, crenate-serrate, 3-nerved, rounded or 
obtusish at the base, green and sparingly puberulent or glabrate above, 
paler and grayish-tomentulose beneath, 14 to 18 lines long, 7 to 12 lines 
broad; petioles reddish, puberulent, 3 lines long: inflorescences 6-10- 
headed flat-topped umbelliform corymbs terminating short opposite lateral 
and terminal branchlets (1 to 2 inches in length), and together forming 
more or less elongated leafy panicles; pedicels densely pubescent, — 
ing, 2 to 4 lines long, subtended at the base by very reduced leaves an 
often bearing one or more short subulate bractlets: heads 3} to 4 lines . 
height ; involucre relatively short, imbricated in about 2 series ; scales 1 
to 15, subequal, 1} lines in length, oblong, acutish, puberulent ; aston 
about 16, purplish white: corolla 23-3 lines, gradually enlarged upward: 
achenes linear, a little over a line in length, rather densely white-pubes- — 
