GREENMAN, — NEW ANGIOSPERMS FROM MEXICO. 99 
the narrower and less striate involucral scales, and finally by the more 
humerous fertile flowers. From C. fragiferum, Griseb., which also has 
numerous disk-flowers, C. Pittieri differs in the more spreading 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 
} J hispidulous pubescent above, 
ous-dotted on the surface, 3-neryed 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: cliffs of the Sierra 
de Tepoxtlan, near Cuernavaca, altitude 2285-3000 m., 4 November, 
1901, and 27 November, 1902, C. G. Pringle, 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, Z. W. Nelson, 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- 
