72 CONTRIBUTIONS KROM THE NATIONAL HERBARIUM. 



and glabrous throughout; leaflets all lanceolate, sessile, Blightly acuminate, the 

 odd one 3 to 4.5 cm. long, the laterals notably smaller, all obscurely Bubserrate 

 or dentate: Bamaras large for the foliage, almost invariably triquetrous, th< 

 broadly round-cordate, the apex being narrower, yet rather broad and emarginate; 

 body round-oval, not transverse-rugose but deeply pitted-reticulate, a conspicuous 

 gland in each pit, the whole body slightly circumvallate, of less than the width of 

 the wing, t lu- fruit as a whole 1.5 cm. lorn: and <|ihte a^ broad near the base. 



ad Canyon of the Colorado, Arizona, excellent specimen in the National 

 Herbarium, collected by J. W. Tourney, July 11. 1892. 



47. Ptelea lutescens, Bp. nov. 



Bark of all twigs and branches whitish and shining as well as Btrongly rugulose 

 and faintly and sparingly glandular- tuberculate: foliage light green, a little pale 

 beneath, of barely Bubcoriaceous text mc densely and minutely dotted on both 

 odd lea t let lanceolate above a rather long en urate base, l to 6 cm. long, laterals from 

 nearly as large to smaller by one-half, obliquely lanceolate, all lightly Bubserrate- 

 toothed and quite Bessile: samaras large, Buborbicular, 2 cui. wide and not quite as 

 long, Bubtruncate across the broad summit, the base often Blightly retuse; bod} oval, 

 of little more than half the width of the wing, faintly transverse-rugose and circum- 

 vallate, not Btrongly gland-dotted; style ami stipe about equal. 



Species of northwestern Arizona, inhabiting canyons tributary to the Grand Can- 

 yon of the Colorado, the best specimen from Red Canyon Trail, collected June 10, 

 1901, by Lester F. Ward (type in the National Herbarium). Younger material, with 

 fruit not mature, from Bright Angel Trail, by l>r. ('. Hart Merriam, May 10, 1903. 

 These last imperfect specimens have smaller relatively broader leaflets, and may 

 possibly represent another species. 



48. Ptelea eleg-ans. sp. nov. 



Twigs much smoother than in the last, and straw-colored rather than whitish, 

 the rugosity less prominent: leaves thinner, twice as large, the middle leaflet lance- 

 olate, acuminate, all these sessile, obscurely subserrate- toothed: samaras fully 2 cm. 

 wide and of the same length except as notched broadly and deeply at both ends 

 between rounded cordate lobes; body obovoid, distinctly yet delicately transverse- 

 rugose not circumvallate, small dotted; style short, stipe none. 



Grand Canyon of the Colorado. Arizona, June 14, 1891, 1>. T. McDougal, the 

 shrub said to grow "in rich soil and in water.*" The only specimens seen are in 

 the National 1 [erbarium. 



49. Ptelea confinis, Bp. nov. 



Immature twigs of the season, short, crooked, whitish, rugulose and polished, but 

 also sparingly pubescent; thosea year or two old dull brownish, glabrate, less rugu- 

 notably glandular-tuberculate: leaves small, of a light somewhat yellowish 

 green above, paler and glaucescent beneath; odd leaflet .'! to 4 cm. long, rhombic- 

 lanceolate or merely ovate-lanceolate, the laterals almost as large, obliquely lanceo- 

 late, all acutieh, Bessile, finely and evenly or very obscurely serrulate: samaras large 

 for the foliage, suborbicular, L.5 cm. long and of the same breadth, retuse at base, 

 minutely cuspidate-acute at apex; body oval, of less than the width of the wing, con- 

 spicuously transverse-rugose and dotted; style and stipe both short 



El Paso, Texas, April. 1881, <>. Et. Vasey; specimens with fruit unripe, but appar- 

 ently almost or quite full grown. 



The plant is interesting as belonging to that group of white-barked Bpecies inhab- 

 iting the region of the Grand Canyon of the Colorado in northwestern Arizona and 

 adjacent Utah. 



The material examined is on four sheets in the National I [erbarium, among which 

 1 would name that on sheet 15254 as the type. 



