GREENE— PTELEA IN THE WEST AND 8OUTHWE8T. 63 



Babcoriaoeous, of a deep, slightly bluish-green above, very glaucous beneath, gla- 

 brouson both face-; middle leaflet ovate-elliptic, acute, subserrate-crenate or sub- 

 entire, 3.5 to 6 cm. long, the laterals similar, often quite as large, oblique-ovate or 

 else almost equal-sided and ovate: samaras orbicular to Bubquadrate-oval, the 

 largest nearly 2 cm. long and elongated, the smaller about 1.5 ••in. and orbicular; 

 body large, oval, deeply and coarsely pitted, rather than transverse-rugose, gland 

 dots few but not obscure; stipe very short, Btyle quite long. 



Fort Huachuca, Arizona, September, 1891, T. E. Wilcox; type in National Her- 

 barium. Species allied to tin- foregoing, as indicated by the coriaceous blue-green 

 foliage, but specifically well marked by its total lack of pubescence, long Blender 

 petioles, and unusually warty twigs. 



18. Ptelea crenata, sp. nov. 



Twigs bright chestnut-color and glabrous, more glandular-tuberculate than rugose: 

 leaves bluish-green and strongly punctate above, glaucescent beneath, with traces 

 of pubescence on both faces and in texture lairly subcoriaceous; odd leaflet ovate, 

 not inclining to rhomboid, 4.5 to »> cm. long, rather obtuse at apex, at base acute 

 but sessile, the pair oval, 1 nit obliquely so, much or little small, all distinctly cre- 

 oate: samaras small for the foliage, nearly orbicular, 1.5 cm. wide, not quite as long, 

 the apex being retuse, the base truncate; body orbicular, its width rather greater 

 than that of the wing, not circumvallate, the ridges low and irregular but coarse, 

 dot- obscure and few; style and stipe both short, subequal. 



In some part of northern Arizona south of Flagstaff, J. W. Tourney, September, 

 1894. Allied to the last two, but not to be confused with either. Type in the her- 

 barium of the California Academy of Sciences. 



19. Ptelea jucunda, sp. nov. 



Twi^rs of the season chestnut-brown, tuberculate, minutely and only sparsely 

 pubescent, the older glabrate, dark, polished: leaves subcoriaceous, dull blue-green 

 above, merely glaucescent beneath, everywhere sparsely and obscurely pubescent; 

 middle leaflet lance-obovate or in somecuneate from the middle, 4 to 5 cm. long, 

 obtusish to very acute, subentive orcrenate, the pair not much smaller, obliquely 

 ovate or oval, all sessile: samaras round -obovate, rather small. 1.2 to 1.4 cm. long, 

 acutish at the narrowed base, commonly emarginate at summit; body round-oval, 

 of the width of the wing, coarsely and irregularly rugose, lightly circumvallate, 

 notably punctate; style and stipe equal. 



San Luis .Mountains, on the Mexican boundary line, Arizona. June l'">. 1892, E. A. 

 Mearns, no. 383, as in the National Herbarium. A handsome species with glossy 

 chestnut-colored twigs and branches, rich green perhaps persistent foliage, and 

 smallish but elegant samaras. 



20. Ptelea sancta, sp. nov. 



Mature twi'_rs of the season chest nut-color, short, rugulose, glabrous or with minute 

 scattered hairs, the older like them but glabrous: leaves small, glaucescent on both 

 faces and small-dotted, midvein and veinlets slender and whitish, a scanty minute 

 histellous hairiness along them, the leaf margins unevenly crenate; odd leaflet 

 broadly oborate above and abrupt cuneate base, varying to rhomb, .id -ovate, obtuse or 

 acutish, 3.5 to 4.5 cm. long, 2 to 2.5 wide above the middle, the pair smaller by less 

 than one-third, very inequilateral: samara- of the smallest, round-obovate or Bubpy- 

 riform in outline, 1 to 1.5 cm. long; body large in proportion t<> the twig, oval or 

 obovoid, with broad and low not very definitely transverse rugosity; Btyle and stipe 

 subequal, both short. 



San Jose" Mountain-, Sonora, Mexico, August 3, 1893, Dr. E. A. Mearns, U. S. 

 Army; -pedes well marked and not Otherwise known. Type in the National Herb- 

 arium. 



