ROBINSON. — MEXICAN PLANTS. 333 



breadth) ; involucres only 2 or 3 ram. 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 1 1 cm. long, 

 7 to 8 cm. broad, 5-nerved from the base, slightly paler beneath ; petioles 

 relatively short, 1 to 1.3 cm. long, puberulent : heads about 50 in a 

 terminal flat-topped corymb; pedicels filiform, flexuous, 5 mm. long; 

 iuvolucral bracts about 14, subequal, linear, acute, 1-3-nerved toward 

 the base, G mm. long ; flowers about 1 6 ; corolla probably white or pale, 

 5 mm. long, equalled by the white pappus ; achenes glabrous, gray. — 

 Collected by ('. G. Pringle in springy places near Guadalajara, Jalisco, 

 Mexico, G July, 1889, no. 2878. 



E. desquamans. Copiously branched shrub ; branches spreading, 

 lignescent nearly to tin' tips; internodes mostly very short, soon covered 

 by a grayish cortex : haves opposite, petiolate, small, oval, obtuse or 

 merely acutisb at each end, 1.8 cm. 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 nea$ 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, 

 no. 5858. Type in herb. Gray. 



E. glatjcum, Klatt, Leopoldina, xx. 89 (1884). The publication of 

 this species has been unfortunate in several ways. The name first 

 appears in print as " E. glaitcum, 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 



