340 PROCEEDINGS OF THE AMERICAN ACADEMY. 
branched and somewhat thyrsoid from the middle, pubescent ; involucral 
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, 2.6 mm. long, the throat funnel-formed without sharp 
demarcation from the relatively short proper 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. scorovoniorpEs, 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. 
H. 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 em. 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 H. 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 em. long, channelled above: 
inflorescences trichotomous round-topped corymbose panicles, seldom 
over 5 cm. in breadth; pedicels and pale green subherbaceous loosely 
- imbricated obtusish involucral scales slightly woolly: flowers about 23 in 
ae a head, 7 mm. in length; corollas white, gradually enlarged from the 
