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 : acheiies 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 Cueruavaca, 

 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 cm. long, 1.2 to 2 cm. broad, 

 entire or obscurely serrate, revolute at the margin, acute at both ends, 

 tliickish, 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 par- 

 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 un- 

 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 jDroper 

 tube greenish, about equalling tlie 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 in 

 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; 

 bractlets filiforra-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 browu^ somewhat tapering toward 



