614 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 ram. in diameter 

 (excl. of ligules), on flexuous pubescent pedicels in a loose panicle : rays 

 about 5, white, 7 ram. long. — Temperate regions on the Andes of 

 Venezuela, Merida, Moritz, no. 1386; Quebrada near Quetame, U. S. 

 Colombia, Andre, no. 862. 



15. M. guateraalensis. 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. — M. patens, Coulter 

 in J. Donnell Smith, 1. c, not Gray. — Guatemala on the Volcano Jumay- 

 tepeque, Depart. Santa Rosa, altitude 1,800 m., Heyde & Lux, December, 

 1892, no. 4216 of Mr. J. Donnell Smith's sets. 



•w- -M- Leaves scabrous above. 



1 6. 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. 



•<- t- -^ I- Leaves petioled, ovate or ovate-lanceolate, 4 to 7 cm. broad, crenate 

 or serrate, or shallowly 1-lobed on either side. 



*+ Erect shrubs (at least showing in specimens no sign of climbing or trailing 

 habit) : leaves of membranous but of firm often harsh texture : peduncles 

 erect or nearly so. 



= Pales gradually narrowed to a long stout at length squarrosely spreading or 

 recurved stramineous spintescent tip. 



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 green 

 and scabrous above, slightly paler and glabrate beneath : heads (not 

 numerous) on stiffish peduncles; disk globose, in anthesis 1.3 cm. broad: 

 rays about 8, 1 cm. long, white : pales nearly glabrous, accrescent, at 

 length 1 to 2 cm. long, contorted and squarrose, thickish, firm and pun- 



