:)40 PROCEEDINGS OP THE AMERICAN ACADEMY. 



branched and somewhat thyreoid from the middle, pubescent ; iuvolucra] 

 bracts about 10, oblong, pubescent d, subequal (only •_'.•"» mm. 



long pt the 1 or 2 calyculate external ones flowers about 1". 



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

 demarcation from the relatively Bhort proper tube : achenes at length 

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

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

 tude 1,700 to 2,000 m.. -1 to •". October, 1898, no. 197. Types in herb. 

 i S. -Nat. Museum and herb. Gray. 



E. S( orodonioides, Gray, var. grossedentatum. Leaves deltoid, 



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



copious and shorter than iii tin- typical form. — Collected by < '. • i. Prin- 



on limestone hills near Tula. Hidalgo, 20 September, 1899, do 824 1. 



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

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

 t lie base, acuminate or narrowed to an obtusisb tip, glabrate above, gl 

 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 

 corymh : the branches filiform, opposite or alternate, bearing 1 to several 

 small nearly orbicular Bhort-petioled bracts ( 1 to '< mm. in diameter) : 

 pedicels 1 to 7 nun. long, minutely bracteolate; scales of the involucre 

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

 the summit, the inner about 1 mm. long, the two or three outer consider- 

 ably shorter; head- 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 ('. & 

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



Type in herb. Gray. This -j ies i- related to E. guadalupense, but is 



probably perennial and differ- much in pubescence and in the pi 

 of the orbicular bracts. 



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

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

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



or subcordate at the base, pale green and merely pulverulent ab 

 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 panic!. dom 



;■ ■"» cm. in breadth: pedicels and pale green Bubherbaceous loosely 

 '.lubricated obtusisb involucral Bcales slightly woolly: flowers about '_'•"< in 

 ahead. 7 mm. in length: corollas white, gradually enlarged from the 



