840 PROCEEDINGS OF THE AMERICAN ACADEMY. 



branched and somewhat thyrsoid from the middle, pubescent ; invohicral 

 bracts about 10, oblong, pubescent, green, subequal (only 2.5 mm. 

 long) except the 1 or 2 calyculate external ones: flowers about 10: 

 corollas white, 2.5 mm. long, the throat funnel-formed without sharp 

 demarcation from the relatively short projier tube : achenes at length 

 black, 1.5 mm. long: pappus white, equalling the corolla, not copious. — 

 Collected by E. A. Goldman near Batopilas, Chihuahua, Mexico, alti- 

 tude 1,700 to 2,000 m., 4 to 5 October, 1898, no. 197. Types in herb. 

 U. S. Nat. Museum and herb. Gray. 



E. scoRODONioiDES, Gray, var. grossedentatum. Leaves deltoid, 

 hastate, rather deeply cordate, coarsely crenate-toothed : pubescence less 

 copious and shorter than in the typical form. — Collected by C. G. Prin- 

 gle on limestone hills near Tula, Hidalgo, 20 September, 1899, no 8244. 



E. Selerianum. Branches opposite, weak, flexuous, terete, striate, 

 finely pubescent : leaves opposite, petiolate, ovate, abrupt or cordate at 

 the base, acuminate or narrowed to an obtusish tip, glabrate above, gray- 

 tomentulose beneath, 1.5 to 3 cm. long, two-thirds as broad, crenate ; 

 petioles 1 to 1.5 cm. long: inflorescence a lax flat-topped compound 

 corymb ; the branches filiform, opposite or alternate, bearing 1 to several 

 small nearly orbicular short-petioled bracts (4 to 5 mm. in diameter) ; 

 pedicels 4 to 7 mm. long, minutely bracteolate : scales of the involucre 

 about 13, oblong, pale green or stramineous, striate, obtuse or erose at 

 the summit, the inner about 4 mm. long, the two or three outer consider- 

 ably shorter; heads about 15-flowered; flowers apparently pale or white: 

 corolla 2.3 mm. long ; the throat exceeding the proper tube : pappus 

 white, not very copious : achenes black, glabrous. — Collected by C. & 

 E. Seler, at Hacienda Petapa, Tuxtla, Chiapas, Mexico, 1896, no. 1939. 

 Type in herb. Gray. This species is related to E. guadalupense^ but is 

 probably perennial and differs much in pubescence and in the presence 

 of the orbicular bracts. 



E. Smithii. Shrub, 1 to 2 m. high, cinereous-puberulent or tomen- 

 tulose : branches opposite, spreading, covered with fissured buff cortex : 

 leaves opposite, ovate inclining to be deltoid, rounded at the apex, trun- 

 cate or subcordate at the base, pale green and merely pulverulent above, 

 cinereous-tomentulose and veiny beneath, crenate to entire, 2.3 to 6 cm. 

 long, 2 to 4.5 cm. broad; petioles 1 to 1.5 cm. long, channelled above: 

 inflorescences trichotomous round-topped corymbose panicles, seldom 

 over 5 cm. in breadth ; pedicels and pale green subherbaceous loosely 

 imbricated obtusish iuvolucral scales slightly woolly : flowers about 23 in 

 a head, 7 mm. in length ; corollas white, gradually enlarged from the 



