ROSE—MEXICAN AND CENTRAL AMERICAN PLANTS. 277 
nished as if that of early summer at the North, are evidence that the species comes 
into leaf and flower only late in summer, after the beginning of the rainy season. 
‘“‘We have in the United States no Ptelea to equal this in the beauty of its bright 
green almost brilliant foliage, a strong tinge of which is held by even the mature 
fruit.’’ 
Ptelea megacarpa Rose, Contr. Nat. Herb. 10: 68. 1906. 
‘‘Twigs tortuously striate rather than rugulose, and with glands between the lines; 
bark chestnut-colored when mature, glabrous: leaves large, of thin texture, vivid 
dark-green on both faces, scarcely lighter beneath and not in the least glaucescent, 
glabrous ; leaflets ovate-elliptic, the pair almost or quite as large as the odd one, 
oblique rather than notably inequilateral, all cuspidately acuminate, entire, the odd 
one 7 to 12 cm. long: samaras very large, thin and flat, the circumscription exactly 
orbicular, abruptly subcordate at base and equally obcordate-notched at apex, both 
the length and breadth about 3.5 em.; body small in proportion to the wing, circum- 
vallate, transverse-rugose, almost dotless, as also the wing; style of thrice the length 
of the stipe. 
“Dr. Rose establishes this handsome species on Mr. Pringle’s no, 8868 (type in the 
National Herbarium), from the State of Hidalgo, Mexico; and it has been so 
distributed. 
‘‘Mr. Pringle reports it to attain the dimensions of a small tree at about 1,600 
meters altitude below Trinidad Iron Works, where it was obtained by him June 2, 
1904. Flowers were collected May 10, but unhappily none but the pistillate ; so that 
the character of the filaments can not be given.”’ 
Ptelea obtusata Greene, Contr. Nat. Herb. 10: 61. 1906. 
Distribution : Coahuila. 
Ptelea pumila Greene, Contr. Nat. Herb. 10: 61. 1906. | 
Distribution: Coahuila. 
Ptelea sancta Greene, Contr. Nat. Herb, 10: 63. 1906. 
Distribution : Sonora. 
Ptelea scutellata Greene, Contr. Nat. Herb. 10: 62. 1906. 
Distribution: Chihuahua. 
Ptelea subintegra (rreene, Contr. Nat. Herb. 10: 61. 1906. 
Distribution: Durango. 
THE SPECIES OF TARAVALIA. 
Three species of Taravalia have been described, all coming from 
Lower California. They are as follows: 
Taravalia aptera (Parry) Greene, Leaflets 1: 223. 1906. 
Ptelea aptera Parry, Proc. Davenp. Acad. 4: 39. 1884. 
Distribution : Lower California. 
Taravalia nucifera Greene, Leaflets 1: 222. 1906. 
Ptelea nucifera Greene, Contr. Nat. Herb. 10: 75. 1906. 
Distribution: Lower California. 
Taravalia obscura Greene, Leaflets 1: 223. 1906. 
Ptelea obscura Greene, Contr. Nat. Herb. 10: 76. 1906. 
Distribution : Lower California. 
