GREENE— PTELEA IN THE WEST AND SOUTHWEST. Of) 



round-oval, more or less circumvallate and coarsely low-rugose, the ridges mi 



less confluent into a pitted reticulation and sparsely and faintly dotted, the whole 



large in proportion to the wing; style and stipe about equal, both prominent. 



In various mountain ranges along the Mexican border in southern Arizona; the 

 best type from Fori Bowie, May, L894, collected by A. K. Fisher. Vigorous branches 

 with the largesi of foliage and immature fruit are from Fort Huachuca, by Dr. I.. 

 Palmer, 1898, no. 428; both these as in the National Herbarium. Asheel taken by 

 Dr. Mearns, in August, L893, from near Monument no. 88 of the Mexican boundary 

 line, "ii San Jose* Mountain, presents Borne differences, and possibly may represent 

 yet another species; as also many specimens collected in the Santa Rita Mountains 

 by Mr. Pringle in 1881; though I tentatively refer all these to one. 



25. Ptelea attrita, sp. nov. 



Character of twigs, color and texture of foliage, etc., quite as in /'. betulifolia, but 

 leaflets all narrow and lanceolate, distinctly crenate rather than Berrate, more or less 

 pubescent on both faces; odd leaflet 5 to 7 cm. long, the laterals closely similar, a 

 tritle smaller, Bcarcely inequilateral: samaras oval, many triquetrous; body oval, 

 large and thick, of more than the width of the wing, not circumvallate, faintly and 

 Bparsely punctate, both its rugosity and the reticulation of the wing low and indis- 

 tinct as if worn down by friction l; style and stipe both short, neither one prominent. 



Camp Bowie, Arizona, J. T. Rothrock (in Wheeler's Exploration , 1874, distributed 

 under number 499, at least as in the National Herbarium. Manifestly a near relative 

 of P. betulifolia; possibly to be proven confluent with it. It bo, certainty a marked 

 variety. 



26. Ptelea similis, sp. nov. 



Twigs and branches chestnut-color, shining, white-dotted, pubescent the first 

 season only, tortuous-angled rather than rugose: leaves subcoriaceous, very rich 

 bright green above, the veins whitish-hirtellous, beneath very pale, with both a 

 dense bloom and a short villous pubescence; odd leaflet cuneate-obovate to broadly 

 and sharply rhomboid and rhombic-lanceolate, 4.5 to 7 ••in. long, petiolulate, the 

 pair often similar, smaller by but one-fourth or one-third, all entire or subserrulate: 

 samaras broadly ovate, 2 cm. long, with base broad and subtruncate, apex abruptly 

 acute and also mucronulate; body large, ovate, much broader than the wing, trans- 

 -rugoee, but the ridges broad and low, forming a circumvallation of the very 

 edge of the body rather than beyond and around its base, gland-dots obscure; stipe 

 very short, style thrice as long and prominent, the wing being broad all around the 

 summit, and nearly obsolete al the very base. 



Extreme eastern Arizona. :;"> miles north of Clifton, at an altitude of 1,660 meters, 

 in the canyon of Blue River, collected by Dr. Walter Hough, July 5, 1905, the 

 specimen in the National Herbarium. Species intimately related to the two last 

 preceding, if foliage is to be the more important index to affinity. Fruit of about the 

 same size, but otherwise notably different from that of either: the onlj samara in 

 the genus which, in so far as 1 have seen, may be described as ovate. 



27. Ptelea polyadenia, sp. nov. 



Twigs of the season invested with a velvety ferruginous tomentum concealing all 

 unevenness, those of the second year glabrate, dull, dark brown, low-rugose: leaves 

 subcoriaceous, 6 cm. long, the upper face light green and polished, but with also a 

 Bparse short pubescence, and closely dotted with dark glands; odd leaflet ovate-elliptic, 

 more acute at base than at apex where it i- bluntly short-pointed, laterals less than 

 one-third smaller, obliquely oval, being rather notably inequilateral, all definitely, 

 though lightly, crenate: Bamaras round-obovate, 1.5 cm. long, retuse or emarginate, 

 thickish and hard as well as slightly concavo-convex in maturity: body round-oval. 



