66 CONTEIBl riONS FROM THE NATIONAL BEBBABIUM. 



thick, of lesa than the average width <»!' the wing, nol circomvallate, distinctly and 

 closely trans\ erse-rug< eeand strongly dotted; style and stipe nearly equal, both Bhort 

 The type of this uncommonlj well -marked Bpecies is on National Herbarium sheet 

 no. L5267, purporting to have been obtained by Dr. Bigelovt on Whipple's Expe- 

 dition, "ii the Canadian River, somewhere between Fori Smith and the Rio Grande. 



There ale t\\t> Other sheets from the >aine general region, collected more recently, 



that may or may n<>t belong here one by Dr. I'.. Palmer, from between Fort <'"1>1> 

 and Fori Arbuckle, in L868, and one by M. A. Carleton, from Cheyenne County, Okla- 

 homa, June, 1891. Both these are in early and immature state, though the fruits, if 

 not mature, are nevertheless full grown and similar to those of the type, while, if the 

 foliage is leas remarkably gland-dotted, that may well be owing to their immaturity. 



28. Ptelea aboriginum. sp. nov 



Twigs of the season appearing more or less rugose, but the unevenness obscured 

 by a short dense spreading pubescence, the older glabrate, smoothish, dark grayish- 

 brown: leaves subcoriaceous, of a rather lively green above, pale beneath, both faces 

 with obscure and scattered hints of pubescence and conspicuously punctate: odd leaf- 

 let obovate-elliptic to rhomboid-elliptic <>r rhomboid-lanceolate, about 5 to 7 cm. long, 

 acute at apex, crenate or subentire, the pair quite similar, but smaller by one-third 

 or one-half, seldom obviously inequilateral : samara 1.5 to 2 cm. long, almost as broad, 

 little deviating from the orbicular, truncate or emarginate at base, at apex usually 

 obtuse, sometime- retuse; bodythick, round-oval, large, its width notably exceeding 

 that of the wing, lightly circum vallate, the transverse rugosity low, somewhat retlcu- 

 lately broken, the gland dots large and obvious; Btipa broad, cuneate-linear, a little 

 Longer than the slender style. 



Rocky hills, Signal Mountain, Indian Territory, August 4, 1891, C. 8. Sheldon, 

 no. -47. as in the National Herbarium. 



29. Ptelea lucida, sp. nov. 



Twigs dark red-brown, low-rugose, obscurely if at all glandular, glabrous or with 

 scattered small hair-: leaves not large, subcoriaceous, glabrous except a few scattered 

 hairs along the margin and the mid vein beneath, bright green and shining above, 

 lighter and without luster beneath, in no part pale or glaucescent ; odd leal let cuneate- 

 obovate, very obtuse, 4 to 5 cm. !<>n<r, 2 to 2.5 cm. wide above the middle, all 

 obscurely crenulate, though seeming quite entire, a very narrow margin being revo- 

 lute, the pair like the odd one in outline though smaller and inequilateral: samaras 

 large for the foliage, suborbicular, 2 cm. wide, the length somewhat less, both ends 

 being retuse, the body round-oval, of less than the width of the wing, lightly cir- 

 cumvallate, the rugosity obscure and inclined to be radiate. 



Rocky bluffs of Comanche Peak, Texas, .1. Keveivhon. .June, 1882, no. 1229, 88 in 

 the herbarium of John Donnell Smith. 



In the National Herbarium, occupying sheet no. 125, are two immature tu igs from 

 Gillespie County. Texas, collected by G. Jenny, that seem to be /'. lucida. A third, 

 on Bheet 358374 from Kerr County, in the same State, by W. L. Bray, is obviously to 

 be referred here, although fruit in this is only half grown. The leaves in these early 

 specimens are of course thin, not subcoriaceous as in the mature type specimen col- 

 lected by Reverchon. 



30. Ptelea toxicodendron Small, Bull. Torr. Club 28 : 294. L901. 



Mature twigs dull rather dark brown, glabrous, remarkably smooth; foliage of a 

 vivid almost Bhining green above, less vivid but not pale beneath, in age doubtleal 

 Bubcoriaceous; odd leaflet obovate, 4.5 to 6 cm. long, abruptly acute at base, at apei 



obtuse or even emar-jinate, plainly crenate, the larger doubly so. the pair commonly 

 smaller by one-half or one-third, nearly ovate and but slightly inequilateral, all 

 sessile: samaras unknown. 



