GREENMAN. • — NEW ANGIOSPERMS FROM MEXICO. 09 



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

 numerous fertile flowers. From 0. fraglferum, 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 fioribundum. 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-hispidnlous-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 ravs : 

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

 inner involucral bracts broadly obovate, closely clasping the acheue, 

 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, G. G. Pringle,nos. 9179, 8686 (hb. Gr.). 



Polyrxmia 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, E. W. Nelson, no. 3221a (hb. 

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



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, mti'Tonate-acute, somewhat sinuate-dentate and 

 bearing on the margins subcartilaginous mucronulations, abruptly liar- 



