GRKKNE PTELEA IN THE WEST AND SOUTHWEST. 65 



round-oval, more or li'j-s circumvallatc^ ami coarf^ely low-rugose, the ridges more or 

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

 large in proj)ortion to the wing; wtylt^ and stifle about equal, both ]»ronnnent. 



In various mountain ranges along the ]Mi'xiL-an border iu soutlieni Arizona; the 

 be.-^ttype from Fort lluwle, May, 1894, collected by A. K. Fisher. Vigorous branches 

 with the largetit of foliage and inunature fruit are from Fort Huaelmca, by Dr. E. 

 Palmer, 1898, no. 428; l>oth these a.s in the National Herbarium. A sheet taken l.)y 

 Dr. Mearns, iu August, 1893, from ]iear Monument no. 88 of the Mexican l)oundary 

 line, on San Jos^ Mountain, pre^^ents some differences, and possibly may represent 

 yet another s'l^ecies; a?- also many specimens collected in the Santa Kita ^Mountains 

 by Mr. Pringle in 1881; thougli 1 tentatively refer all these to one, 



25. Ptelea attrita, sp. no v. 



Character of twigs, color and texture of foliage, etc., quite as in V. betulifoUa, but 

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

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

 trifle smaller, scarcely ine<iuilateral: i^amaray oval, many tritjuetrous; body oval, 

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

 8i)Hrsely innictate, both its rugosity and the reticulation of the wing low and indis- 

 tinct (as if worn down by friction); style and sti]te both short, neither oneprondnent. 



Camp liowie, Arizniia, J. T. Kothroek {in Wheeler's l^xploration), 1874, distril)uted 

 under number 499, at least as in the National Herbarium. I^Ianifestly a near relative 

 of P. hetuVJoliii; possibly to !)e proven conflucJit with it. If so, certainty a m-^.rked 

 variety. 



26. Ptelea siniilis, sp. nov. 



Twigs and branches chestnut-coLjr, shining, white-doited, pubescent the first 

 season only, to^tuous-ang]ed 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-ol>(>vate to broadly 

 and sharjily rhomboid and rhondjic-lanceolate, 4.5 to 7 cm, long, j)etiolulate, the 

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

 samaras broadly ovate, 2 cm. long, with base broad an<l subtruncate, a])ex abru])tly 

 acute and also mucroniilate; bo<ly large, ovate, much broader than the wing, trans- 

 verse-rugose, but the ridges broad and h)W, ff^rming a circumvallation uf the very 

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

 very sliort, fityle thrice as long an<l prominent, the wing being broad all around the 

 summit, and nearly obsolete at the very base. 



Extreme eastern Aiizona, 35 miles north of Clifton, at an altitude of 1,660 meters, 

 in the canyim of Blue River, collected by Dr. A\'aUer Hough, July 5, 1905, the 

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

 preceding, if h>llag(' is to be the more important index toaliinity. Fiuit of about the 

 same size, but otherwise notably diffident fnnn that of eiftier; the only samara in 

 the genus wh-ich, in so far as I havt^ 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, ihdl, dark l>rown, low-rugose: leaves 

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

 sparse short pubescenee, and closely dotted \\\\\\ dark glands; odd leaflet ovate-elliptic, 

 more acute at base than at apex where it is bluntly shurt-j>ointed, laterals less than 

 one-third smaller, obli<juely oval, being ratlur notably inequilateral, all definitely, 

 though lightly, trenate: samaras rouud-obovate, 1.5 cm. lojig, retuse or emarginate, 

 thickish and hard as well as slightly concavo-convex in maturity; body round-oval, 



