476 PROCEEDINGS OF THE AMERICAN ACADEMY. 
late, 70-100-flowered, nearly 1 cm. in diameter; outer involucral scales 
linear-filiform, ciliated, the inner lance-oblong, acuminate, rigidulous, the 
subscarious margins erose: achenes black, 2 lines long, sharply angled, 
glabrous, very finely and transversely striate; pappus a shallow un- 
toothed cup without awns. — Collected by C. G. Pringle, on mossy sides 
of conglomerate knobs of the Sierra de Tepoxtlan, near Cuernavaca, 
State of Morelos, Mexico, altitude 2,310 m., 31 October, 1900, no. 8362, 
and previously 15 March, 1899, no. 7851. Well marked. Type in 
herb. Gray. 
Ageratum rhytidophyllum. Shrub with opposite terete dark red 
branches covered with a fine crisped cinereous puberulence: leaves op- 
posite, subsessile, lance-oblong, 4 to 7 em. long, 1.2 to 2 cm. broad, 
entire or obscurely serrate, revolute at the margin, acute at both ends, 
thickish, grayish green, scabrous-pubescent and strongly rugose above; 
veins much reticulated and prominulous beneath where covered by 
a dense spreading white pubescence ; interstices covered by aureous pal- 
ticles: inflorescence of compound corymbs terminal upon the branches; 
bracts linear; heads rather small, 5 mm. in diameter, nodding on short 
glandular-puberulent pedicels, about 25-flowered; involucral scales wit 
equal, pluriseriate, lance-linear, acute, pungent, green, striate, finely and 
sparingly pubescent; pales similar but narrower, rather rigid: corolla 
3 mm. long, glabrous but covered with aureous particles; the proper 
tube greenish, about equalling the combined length of the whitish throat 
and lavender colored limb: achenes glabrous; pappus a short obscurely 
toothed cup. — Collected by C. G. Pringle on the Sierra de San Felipe, 
Oaxaca, Mexico, altitude 2,150 m., 5 October, 1894, no. 5675. Type ™ 
herb. Gray. Also secured in an immature state somewhat earlier (20 
September, 1894) in the valley of Oaxaca by E. W. Nelson, no. 1446, 
and a little later (4 November, 1894) in the mountains of San Juan 
del Estado by Rev. L. C. Smith, no. 277. 
Ageratum stachyofolium. Erect perennial with long tough 
filiform white roots; stem 5 to 6 dm. tall, terete, finely striate, purplish, 
densely covered with fine crisped white hairs: leaves elliptical, sessile or 
nearly so, mostly alternate, crenate, obtuse, pubescent upon both sur 
faces, 3-nerved, deep green above, paler green and veiny beneath, 3 cm. 
long, half as broad: corymbs terminal, simple, regular, 7-10-headed 3 
bractlets filiform-spatulate ; pedicels 2 to 2.5 cm. long, canescent-tomen- 
tulose; heads large for the genus, 1.2 cm. in diameter, about 100-flow- 
ered; scales of the involucre linear, acute, strongly striate, hirsute’ 
achenes glabrous, sharply angled, dark brown , somewhat tapering toward 
