476 PROCEEDINGS OF THE AMERICAN ACADEMY. 



late, 70—1 00-flowered, Dearly 1 cm. in diameter: outer involucral scales 

 linear-filiform, ciliated, the inner lance-oblong, acuminate, rigidulous, the 

 3cariou8 margins erose: achenea black, 2 lines long, sharply angled, 

 glabrous, very finely and transversely striate: pappus a shallow un- 

 toothed cup without awn-. — Collected by C. G. Pringle, on mossy sides 

 of conglomerate knobs of the Siena de Tepoxtlan, near Cuernavaca, 

 State of Morelos, .■Mexico, altitude 2,310 m., 31 October, 1900, no. 83G2, 

 and previously 15 March, 1899, no. 7851. Well marked. Type in 

 heil). Gray. 



Ageratum rhytidophyllum. Shrub with opposite terete dark red 

 branches covered with a fine crisped cinereous puberulence: leaves op- 

 posite, Bubsessile, lance-oblong, 4 to 7 cm. long, 1.2 to 2 cm. broad, 

 entire or obscurely serrate, revolute at the margin, acute at both end-. 

 thickish, grayish green, scabrous-pubescent and strongly rugose above; 

 veins much reticulated and prominulous beneath where covered by 

 eading white pubescence ; interstices covered by aureous par- 

 ticles: intlorescence of compound corymbs terminal upon the brandies ; 

 ir; beads 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 

 .'! 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. 

 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 K. W. Nelson, no. 1446, 

 and a little later (4 November, 1894) in the mountains of Sau Joan 

 del Estado by Rev. L. C. Smith, no. 277. 



Ageratum stachyofolium. Erect perennial with long tough 

 • nn white roots; Btem 5 to 6 dm. tall, terete, finely striate, purplish, 

 densely c ivered with fine crisped white hair-: leaves elliptical. e or 



nearly so, mostly alternate, crenate, obtuse, pubescent upon both Bur- 

 t i ses, 3-nerved. <l>-ep green above, paler green and veiny beneath, 3 cm. 

 long, half as broad: corymbs terminal, simple, regular, 7— 10-headed; 

 bractlets filiform-spatulate ; pedicels _ to 2.5 cm. long, canescent-tomen- 

 tulose; heads large for the genua, L.2 cm. in diameter, about 100-flow- 



f the involucre linear, BCUte, Btrongly striate, hirsute: 



achenea glabrous, sharply angled, dark brown, somewhat tapering toward 



