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 mucronate 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. 918. Type in herb. Field Columbian 
Museum. 
= = = Leaves similar in size and contour but dentate with more spreading teeth. 
ea 27. M. pumicota, 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. pauciflora described 
above. — Bull. Soc. Bot. Belg. xxxi. 200.— Costa Rica, in a hedge on 
llanos of Alajuelita, altitude 1,100 m., Pittéer, 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- 
aged base, serrate, about 5 cm. long. 
28. M. eraciris, Sch. Bip. 1. c. 407. Also near MZ. paucifiora, 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, Liebmann, no. 633. Type in herb. Bot. Gard. Copenhagen @3 
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. 8. UnpEa. 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, & An 
Sci. Nat. ser. 3, ix. (1848), 816.— 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 
: - 29. M. cranprrrona, Sch. Bip. Tall shrub, 2 to 4m. high: yours 
iches canescent with minute pulyerulent pubescence: leaves large, 
eee. eee 
