512 PROCEEDINGS OP THE AMERICAN ACADEMY. 



Date, crenulate, 1.4 dm. long; petioles 3 cm. long: heads in a loosft 

 leafy panicle. — Proc. Am. Acad, xxxiii. 93. — Hillsides near Acapulco, 

 Palmer, no. 44. Type in herb. Gray. 



9. M. RosEi, Robinson & Greeuman. Similar to the last, but with 

 lance-ovate serrate unlobed leaves, buUate above, green beneath, not half 

 so broad as long : heads numerous, very silky, borne on filiform pedicels. 

 — Proc. Am. Acad, xxxii. 45. Montanoa sp. Rose, Contrib. U. S. Nat. 

 Herb. i. 103. — Alamos, "W. Mexico, Palmer, no. 394, Goldman, no. 

 294. Type in herb. Gray. 



Subg. 2. AcANTHOCARPHA. Heads of medium size, less numerous : 

 ligules 7 to 10 : pales sub-glabrous or thinly villous, the spiuescent tip 

 straight or recurved. — Montagncea § Acanthocarphce, DC. 1. c. 565. — 

 Leaves ovate to lance-oblong, crenate, serrate, angled or palmately lobed, 

 very rarely {M. macrolepis) pinnately lobed. Nineteen species of Mex- 

 ico and Andean South America. 



* Invoiucral bracts (1 cm. long) spatulate-obovate, considerably exceeding 

 the disk-flowers. 



10. M. Pringlei. Shrub: branches glabrate, covered with a rough 

 gray cortex ; branchlets pulverulent-tomentulose : leaves lanceolate or 

 oblong-lanceolate, acute, serrate, 4 to 8 cm. long, 1.5 to 3 cm. broad, 

 green and scabrous above, canescent-tomentose beneath, gradually nar- 

 rowed into wings decurrent nearly to the base of the petiole : heads few, 

 2 or 3 at the ends of the branches, on slender erect peduncles (4 to 5 cm. 

 long) : ligules about 7, from 6 to 8 mm. long: pales (in anthesis) grad- 

 ually attenuate, villous. — Calcareous hills near Tehuacan, Puebla, 28 

 Jul}", 1897, C. G. Pringle, no. 7491. Well marked by its spatulate 

 invoiucral bracts, which appear to be unique in the genus. Type in 

 herb. Gray. 



* * Invoiucral bracts broadly oblong, obtuse or rounded at the apex (7 to 10 mm. 

 long, half as broad) : leaves pinnately and sinuately 3(-5)-lobed. 



11. M. MACROLEPIS, Robinson & Greenman. Shrub, 1 to 2 m. high: 

 heads few (1 to 5 at the ends of the branches), 1 to 2 cm. in diameter 

 exclusive of rays, conspicuous and well marked in fruit by the elongated 

 gradually attenuate straightish pungent stramineous ciliate but otherwise 

 glabrate pales. — Proc. Am. Acad, xxxii. 44. — Oaxaca, Las Sedas, 

 Pringle, no. 4932, Nacaltepec (Salome), L. G. Smith, no. 818, 29 km. 

 southwest of the city of Oaxaca, E. W. Nelson, no. 1375. Type in herb. 

 Gray. 



