ROBINSON. — MEXICAN PLANTS. 833 
breadth) ; involucres only 2 or 3 mm. long, little imbricated ; the scales 
oblong, scarcely acute, unequal, ciliolate: flowers purple, 6 mm. in length. 
— Collected by C. G. Pringle on lava fields near Cuernavaca, altitude 
1,500 m., no. 8271. The flowers on the fleshy naked branches were 
secured 16 February, and the leaves 29 September, 1899. Very 
distinct in habit from any species of which I can find record. 
E. crenaeum. Erect herb; simple stems so grooved as to be- 
come cross-shaped in transverse section, pulverulent-puberulent ; in- 
ternodes mostly long, the lower more than 1 dm. in length: leaves 
opposite, decussate, ovate, obtusish, crenate, obtuse at the subentire base, 
finely and sparsely pubescent upon both surfaces, 9 to 11 em. long, 
7 to 8 em. broad, 5-nerved from the base, slightly paler beneath ; petioles 
relatively short, 1 to 1.8 cm. long, puberulent: heads about 50 in a 
terminal flat-topped corymb; pedicels filiform, flexuous, 5 mm. long ; 
involucral bracts about 14, subequal, linear, acute, 1-3-nerved toward 
the base, 6 mm. long; flowers about 16; corolla probably white or pale, 
5) mm. long, equalled by the white pappus; achenes glabrous, gray. — 
Collected by C. G. Pringle in springy places near Guadalajara, Jalisco, 
Mexico, 6 July, 1889, no. 2878 
EH. desquamans. Copiously branched shrub; branches spreading, 
lignescent nearly to the tips; internodes mostly very short, soon covered 
by a grayish cortex: leaves opposite, petiolate, small, oval, obtuse or 
merely acutish at each end, 1.8 em. long, 8 to 11 mm. broad, pinnately 
veined, finely serrate, at maturity green above and puberulent only 
under a good lens, paler beneath, when young clothed especially beneath 
with a close silvery web which soon breaks up into deciduous scalelike 
remnants ; petioles 3 to 5 mm. long: inflorescences simple or nearly so, 
terminal, 5—9-headed, racemiform ; pedicels opposite, 1 cm. long, bracteo- 
late near the middle; involucre subsimple, of linear acute brownish 
puberulent subequal bracts about 13 in number and 5 mm. long: flowers 
about 15, 1 cm. long: corolla apparently white or pale, about equalled 
by the copious nearly white pappus: achenes smooth, black, shining, 
sharply angled. — Collected by C. G. Pringle on summit ledges of 
the Sierra de San Felipe, Oaxaca, altitude 3,100 m., 22 May, 1894, 
ho. 5858. Type in herb. Gray. ; 
E. “Gravcum, Klatt, Leopoldina, xx. 89 (1884). The publication of 
this species has been unfortunate in several ways. The name first 
*ppears in print as “ Z. glaucum, Sch. Bip. ex A. Gray” in Hemsl. Biol. 
Cent.-Am. Bot. ii, 95 (1881), where Parry & Palmer's no. 335 from 
San Luis Potosi. is referred to it, This mention cannot constitute 
* 
