518 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Casillas, Depart. Santa Rosa, Guatemala, altitude 1,200 m. and no. 5324 

 of the same set, coll. Thieme at San Pedro Sula, Honduras, altitude 

 250 m. In these plants, which are old enough to show immature fruit, 

 the pales are not only retuse and mucrouate at the apex, but have the 

 wings more or less 2-lobed. Type in herb. Gray. 



26. M. Schottii. Similar in habit : leaves ovate, unlobed, unap- 

 pendaged, serrate, decidedly scabrous above, sordid-tomentulose beneath, 

 9 cm. long: heads decidedly larger than in the preceding species: invo- 

 lucral scales linear, acute, 7 mm. long, pubescent; ligules (about 10) 

 2.2 cm. long. — Yucatan, on a road between Merida and Sisal, Dr. Arthur 

 Schott, 24 October, 1865, no. 913. Type in herb. Field Columbian 

 Museum. 



= = = Leaves similar in size and contour but dentate with more spreading teeth. 



27. M. DUMICOLA, Klatt. Puberulent : leaves deltoid-ovate, un- 

 lobed, dentate rather than serrate, 5 to 6 cm, long, nearly as broad: 

 heads in all observed characters identical with M. paucijlora described 

 above. — Bull. Soc. Bot. Belg. xxxi. 200. — Costa Rica, in a hedge on 

 llanos of Alajuelita, altitude 1,100 m., Pittier, no. 1454 (from the same 

 locality as M. Pittieri, which differs much in the size, contour, and ser- 

 ration of its leaves). Type in herb. Gray. 



= = = = Leaves ovate-lanceolate, rather gradually narrowed to an unappen- 

 daged base, serrate, about 5 cm. long. 



28. M. GRACILIS, Sch. Bip. 1. c. 407. Also near M. paucijlora, from 

 which it differs solely, so far as can be learned, in its more lanceolate- 

 ovate leaves, cuneately narrowed at the base, and in its less numerous 

 ligules (5 in number). — Klatt, Leopoldina, xxiii. 91. — S. Miguel, La 

 Grabra, Liehmann, no. 633. Type in herb. Bot. Gard. Coi)enhagen (?) ; 

 a leaf and good sketch in herb. Gray. If Dr. Klatt is correct in stating 

 the involucral bracts to be glabrous, the species is in this regard very 

 different from the related members of the genus. 



Subg. 3. Uhdea. Heads very large, 4.5 to 8 cm. in diameter incl. 

 the 8 to 12 white or purplish rays: leaves large, sinuate-lobed, mostly 

 pinnatifid. — Uhdea, Kunth, Ind. Sem. Hort. Berol. 1847, p. 13, & Ann. 

 Sci. Nat. ser. 3, ix. (1848), 316. — Probably to be reduced to the follow- 

 ing four species, all of Mexico. 



* Petioles with broad undulate wings extending to the base; lobes of the leaves 



very unequal. 



29. M. GRANDiFLORA, Sch. Bip. Tall shrub, 2 to 4 m. high : young 

 branches canescent with minute pulverulent pubescence : leaves large, 



