GREENMAN. — NEW ANGIOSPERMS FROM MEXICO. 99 



the narrower and less striate involucral scales, and finally by the more 

 numerous fertile flowers. From C fragiferitm, Griseb., which also has 

 numerous disk-flowers, C. Pittieri differs in the more sjireadin^ pubes- 

 cence of the leaves and in the less conspicuous pales of the receptacle. 



Trigonospermum floribundum. Stem 2 to 3 m. high, purplish, 

 striate, at first tawny puberulent later glabrate ; branches and the many- 

 headed compound corymbose cyme rather densely stipitate-glandular : 

 leaves opposite, petiolate, broadly ovate, 0.5 to 1.8 dm. long, 2 to 14 cm. 

 broad, acute, unequally cartilaginous-dentate, cuneate at the base into 1 

 to 5 cm. long petioles, densely subappressed-hispidulous-pubescent above, 

 hirsute-tomentose beneath especially on the midrib and nerves, resinifer- 

 ous-dotted on the surface, 3-nerved from just above the base : heads 

 many, about 5 mm. high, 12 to 18 mm. in diameter including the rays : 

 outer bracts of the involucre linear or linear-oblong, 4 mm. long, obtuse ; 

 inner involucral bracts broadly obovate, closely clasping the achene, 

 appressed-puberulent : rays 5 to 8, yellow, 6 to 8 mm. long, somewhat 

 fan-shaped, unequally dentate : mature achenes obovoid-triangular, 

 smooth and shining. — Mexico. State of Morelos : cliifs of the Sierra 

 de Tepoxtlan, near Cuernavaca, altitude 2285-3000 m., 4 November, 

 1901, and 27 November, 1902, C. G. Frivgle, nos. 9179, 8686 (hb. Gr.). 



Polymnia Nelsonii. Stem striate, sparingly hirsute with horizon- 

 tally spreading jointed hairs : leaves opposite, including the winged 

 clasping petiole 1.5 to 2 dm. long, 1.2 to 1.5 dm. broad, mostly pin- 

 nately 5-lobed, thin, dark green above, paler beneath, sparingly pubes- 

 cent on both surfaces ; lobes ovate or rhombic-ovate, acuminate ; margins 

 remotely denticulate ; petioles broadly winged, 0.8 to 2 cm. in breadth : 

 heads about 3 cm. in diameter, on slender axillary 7 to 10 mm. long 

 peduncles : involucre biseriate ; bracts of the involucre oblong-lanceolate, 

 8 to 10 mm. long, sparingly hirsute, ciliate : ray-flowers 10 to 12 ; rays 

 yellow. — Mexico. State of Chiapas: near Santa Christobal, altitude 

 2150 to 2450 m., 18 September, 1895, K W. MIson, no. 3221a (hb. 

 Gr., & hb. U. S. Nat. Mus.). 



In general P. Nelsonii most closely resembles P. oaxacana^ Schz. 

 Bip. especially in foliar characters, but the yellow rays and the thin or 

 membranous leaves and the sparing pubescence of the same readily 

 distinguish it. 



Rumfordia polymnioides. Stem purplish, striate, hirsute-pubes- 

 cent: leaves opposite, subperfoliate, ovate, 0.5 to 1.5 dm. long, 2.5 to 8 

 cm. broad, acuminate, mucronate-acute, somewhat sinuate-dentate and 

 bearing on the margins subcartilaginous mucronulations, abruptly nar- 



