ROBINSON, —- SPERMATOPHYTES OF MEXICO. 483 
tomentulose under a lens; heads numerous, crowded, small, about 10- 
flowered, short-pedicelled ; scales of the involucre very few, unequal, 
elliptical, rounded at the apex, glabrous but erose-ciliolate, in a dried 
state brown: corolla glabrous or nearly so even at the limb, without 
clearly marked throat, equalled by the white pappus: achenes (young) 
pale, glabrous, 1.8 mm. long. — Collected by E. W. Nelson near Pina- 
bete, Chiapas, Mexico, 8 February, 1896, no. 8785. This species is 
hear but clearly distinct from HZ. daleoides, Hemsl. and Z£. tepicanum, 
Hemsl. 
Eupatorium pleianthum. Doubtless perennial: stem slender, 
terete, scabrous-puberulent, finely striate, reddish brown, loosely few- 
branched above: leaves opposite, ovate, essentially sessile, thickish, 
reticulate-veiny, coarsely few-toothed, acute, cordate, 3-nerved, 2.5 to 
3.5 em. long, two-thirds as broad, slightly scabrous upon both surfaces, 
covered below by bright resinous globules: heads large, 2 cm. in diame- 
ter, slender-pedicelled, erect ; involucral scales imbricated in 3 or 4 rows, 
oval to oblong, rounded at the apex, thin, glabrous and glutinous, striate, 
pale green, scarcely herbaceous: corollas 6 mm. long, gradually nar- 
rowed from the summit to the base, about equalled by the copious stiffish 
tawny pappus: styles very long and conspicuous, clavate; achenes 5 to 
6 mm. in length tapering toward the base, reddish brown, covered with 
resinous globules, not tranversely striate. — EH. adenospermum, var. 
pleianthum, Gray, Proc. Am. Acad. xv. 26.— Collected by Dr. Ber- 
thold Seemann, Western Mexico. ‘Type in herb. Gray. While sharing 
many dhaencteis with H. adenospermum, Sch. Bip., this plant differs so 
markedly in its opposite (not alternate), shorter, ovate not oblong leaves 
of differing dentation that inter gradation seems very unlikely. 
atowiink prionobium. Branches ascending, terete, green, 
striate, puberulent: leaves opposite, petiolate, deltoid, ovate to ov. 
oblong, cordate with open sinus and hastate tendency, acutish to rounded 
at the apex, crenate or crenate-serrate, thickish, bright green but covered 
With short scattered white hairs upon both surfaces, scarcely paler be- 
neath, 2 to 4 em. long, 1.7 to 2.5 em. broad ; petiole puberulent, 6 mm. 
long, suleate upon the upper side: heads small, about 20-flowered, in 
round-topped sessile cinereous-puberulent corymbs ; pedicels 3 to 5 mm. 
long ; bractlets subulate; involucre green, the scales lance-oblong, acute, 
subequal, loosely imbricated, 2.5 mm. long, scarcely half the length of 
the flowers: corolla in dried specimen white, 3 mm. long, with a rela- 
tively long throat narrowed into a shorter tube, glabrous, equalled by 
the bristles of the pappus; these somewhat unequal, barbellate, white 
