514 PROCEEDINGS OF THE AMERICAN ACADEMY. 
slightly auricled at the base, little paler beneath, the margin essentially 
entire; petioles 4 to 10 cm. long: heads rather small, 8 mm. in diameter 
(excl. of ligules), on flexuous pubescent pedicels in a loose panicle: rays 
about 5, white, 7 mm. long. — Temperate regions on the Andes of 
Venezuela, Merida, Moritz, no. 1886; Quebrada near Quetame, U. S. 
Colombia, André, no. 862. 
/ 15. M. guatemalensis. Leaves subcoriaceous, wholly glabrate 
above, and canescent-tomentulose beneath, subentire, 1 dm. in breadth: 
heads larger, 1 cm. broad in anthesis; rays 1.5 cm. long: otherwise simi 
lar in most of its characters to the preceding species. — JZ. patens, Coulter 
in J. Donnell Smith, l. c., not Gray.— Guatemala on the Volcano Jumay- 
tepeque, Depart. Santa Rosa, altitude 1,800 m., Heyde & Laux, December, 
1892, no. 4216 of Mr. J. Donnell Smith’s sets. ~~ 
++ ++ Leaves scabrous above. 
16. M. hexagona. A large tree: branchlets thick, strongly quad- 
rangular, fulvous-tomentose above, at length glabrate: leaves hexagonal- 
ovate, distinctly and rather regularly serrate, about 1.4 dm. long, 1.3 dm. 
broad, acute or subacuminate, scabrous-puberulent above and arachnoid- 
tomentose beneath even in age, obtuse and unappendaged at the base; 
petioles thick, channelled above, wingless, tomentose, 7 cm. long: heads 
numerous and rather large in a very regular opposite-branched leafy 
bracted panicle ; pedicels 1.5 cm. long: involucral bracts lance-oblong, 
2-seriate, acute, 3 to 4 mm. long: ligules 8 to 10, white, more than 2 cm. 
long: fruit unknown. —- Temperate regions in the mountains of Chiapas. 
Ghiesbreght, no. 535; flowering in October. Type in herb. Gray. 
++ + + Leaves Pepsin ovate or ovate-lanceolate, 4 to 7 em. broad, crenate 
serrate, or shallowly 1-lobed on either side. 
++ Erect shrubs (at least showing in specimens no sign of ———s or trailing 
habit): leaves of membranous but of firm often harsh texture : peduncles 
erect or nearly so. 
= Pales paca J narrowed to a long stout at length squarrosely spreading oF 
recurv mineous spinescent tip. 
ra 17. M. FRUTESCENS, Hemsl. Shrub, 3 m. high, with terete glabrous 
or early glabrate often purple branches: leaves ovate-lanceolate, serrate, 
caudate-acuminate, narrowed and unappendaged at the base, bright gree? 
and scabrous si slightly paler and glabrate beneath: heads (no 
numerous) on stiffish peduncles; disk globose, in anthesis 1.3 cm. broad: 
rays about 8, 7 em. long, white: pales nearly glabrous, accrescent, 4 
ae bene Pea contorted and squarrose, thickish, firm and pu? 
