276 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Collected by Mr. E. W. Nelson on road oyer mountain between Victoria and 
Jaumave Valley, altitude 240 to 750 meters, May 31, 1898 (no. 4444). 
THE MEXICAN SPECIES OF PTELEA. 
Dr. E. L. Greene has recently published an exhaustive treatment of 
the genus Ptelea in these contributions,“ in which 14 Mexican species 
are described, all but one of them as new. Three of these, however, 
he has since segregated as a new generic type under the name Tara- 
valia. Below will be found the eleven species of Ptelea attributed to 
Mexico. Dr. Greene’s descriptions of three of these, two based by 
him on material collected by the writer, the third earlier established 
by the writer on material of Mr. Pringle’s, are reprinted in full. 
Ptelea acutifolia Greene & Rose, Contr. Nat. Herb. 10: 68. 1906. 
“Twigs of the season dull chestnut-color, rather sharply and angulately rugose and 
puberulent, the older glabrate, darker, obtusely and tortuously striate: leaves firm 
but not subcoriaceous, deep green above, paler beneath and _ villous-strigulose, 
definitely crenulate, all on elongated petioles mostly 6 to 8 em. long; odd leaflet 
lance-elliptic, very acute at both ends, 5.5 to 8 em. long, the pair usually but little 
smaller and of the same outline, being scarcely inequilateral: samaras small for the 
foliage, transversely subquadrate-orbicular to quite orbicular, the largest and most 
quadrate 2 em. wide, 1.5 em. long, such subtruncate at both ends; body very round- 
ovoid, hardly as broad as the wing, lightly circumvallate, not at all sharply trans- 
verse-rugose, moderately punctate; style and stipe nearly equal. 
“State of Jalisco, Mexico, on the road between Huejuquillaand Mesquitec, August 
25, 1897, Dr. J. N. Rose, no. 2580, as in the National Herbarium. Species not other- 
wise known, and remarkable for the great length of the petioles, the. leaflets not 
acuminate, though very acute.’’ 
Ptelea coahuilensis Greene, Contr. Nat. Herb. 10: 61. 1906. 
Distribution: Coahuila. 
Ptelea cuspidata Greene, Contr. Nat. Herb. 10: 62. 1906. 
Distribution: Chihuahua. 
Ptelea glauca Greene, Contr. Nat. Herb. 10: 64. 1906. 
Distribution: Sonora. 
Ptelea laetissima Greene & Rose, Contr. Nat. Herb. 10: 69. 1906. 
“Twigs of the season dull red-brown, lightly rugulose, puberulent, the older dull 
brown, glabrate, smoothish: leaves small, of a light very bright green above, light dull 
green beneath, with faint trace of minute scattered hairiness on both faces, but to the 
unaided eye glabrous; odd leaflet lanceolate, acutish at both ends, about 5 cm. long, 
the pair similar and hardly inequilateral, only about half as large, all sessile, obso- 
letely crenulate: samaras large for the foliage, greenish in maturity, orbicular, about 
1.8 cm. long and broad, truncate at base, emarginate at apex; body oval, of less than 
the width of the wing, prominently rugose, but the wrinkles not very continuously 
transverse, punctuation not strong; style and stipe nearly equal, both slender yet 
prominent. 
‘‘Near Tehuacan, State of Puebla, Mexico, September, 1905, collected by Messrs. 
Rose, Painter, and Rose (no. 9927), type in the National Herbarium. The speci. 
mens being at that date in fruit nearly matured, and with foliage bright and untar- 
«Contr. Nat. Herb. 10: 49-78. 1906. 
