60 CONTRIBUTIONS PROM THE NATIONAL HERBARIUM. 



1.5 cm. wide, varying from orbicular toward ovate, only obtuse at base, the apei 

 emarginate; body oval, both large and thick in proportion to the \\ inir, the \\ i<lth of 

 the two about equal, neither circum vallate nor the ridges running crosswise, but 

 mostly broken into reticulation, gland-dots mostly lev and rather obscure; style also 

 quite obscure, longer than the >t i j»«-. \\\\> more obvious. 



Siena Blanca, \. w Mexico, August 17. 1897, at 2,120 meters, collected bj I 0. 

 Wooton and by him distributed under no. 657, at least as in my herbarium, where 

 the only specimens know n tome are preserved. It is manifestly allied rather closely 

 to P. Uosula of the Organ Mountains, but has a very different thin, large, and 

 handsome foliage, the leaflets recalling the leaves of the choke cherry, but thinner 

 and paler on both faces. I suppose by the foliage thai its habital must be in deep 

 shaded canyons, where the air is moist from the Bpray of streams. 



8. Ptelea villosula, Bp. nov. 



Twigs of the season slender, chestnut-color, almost or quite glabrous, Bhort-rugu- 

 lose and tuberculate, those a year old not very different: leaves quite firm, membra- 

 naceous but not Bubcoriaceous, glaucescent above and nearly glabrous, beneath 

 whitened by bloom and a white villous Bhort pubescence; odd leaflet broadly 

 rhombic-lanceolate or ovate-lanceolate, tapering to both ends but acute at neither, 

 crenulate, the length 4 to 5 cm., the pair Bmaller by one-third to one-half, and vary- 

 ingly inequilateral: samaras large in proportion to the foliage, L.2 to L.8 cm. long, 

 almost as broad, usually subquadrate-orbicular, being broadly truncate at both end-; 

 body neither large nor thick as compared with the wing, oval, coarsely and more or 

 less transversely rugose, with or without a trace of circum vallation, the gland-dots 

 few, coarse; style and stipe equal, short, neither one conspicuous. 



Known only from the isolated Organ .Mountains of southern New Mexico. ;i- 

 collected .Inly 11. 1897, by E. < >. Wooton, who distributed excellent fruiting speci- 

 mens under no. 134, as in my herbarium I type and the National 1 [erbarium. 



From the -mall size and rather firm texture of the foliage I infer this to In- an 

 inhabitant of no closed and shady canyon, but of the open slopes or summits of the 

 mountain-; but the collector- never vouschafe the least information upon these 

 important matter-. 



9. Ptelea tortuosa, .-p. nov. 



Twigs and branches short, rigid, tortuous, those of the season smoothish, puberu- 

 lent. the older dull dark brown, glabra te: mature foliage quite firm but not Bubcori- 

 aceous, pale-green, glabrate ami punctate above, glaucus and whitish-tomentulose 

 beneath; odd Leaflet 3.5 to 6 cm. long, ovate above a short tapering base, hardly 

 acute at apex, lightly and unevenly crenate; the pair variously Bmaller, obliquely 

 oval, obtuse at both end-, more distinctly crenate, all sessile: samara Buborbicular 

 but broader than long, the width 1.5 cm., broad and subtruncate at both ends; 

 body round-oval, nearly central, not circum vallate, about as wide as the wing, ridges 

 low. more or le— transverse and unbroken, gland-dots obvious only under a lens. 



Northern Arizona, in the San Francisco Mountain Forest Reserve, J. B. Leiberg, 

 Augusl 10, L901, no. 5822 as in the National Herbarium. 



'Idie type specimens have the appearance of a low shrub of ] r and arid soil. 



But from the same neighborl 1 then- are before me two sheets, one by Mr. Heller, 



the other from Dr. McDougal, both young and i latnre fruit, which have the 



appearance of a different species; and in the first draft of this paper I had named 

 and described them a- such. The lea\e- are broader, larger, thinner, less pubescent 

 beneath, etc. but they may possibly represent /'. tortuosa as grown in a shady can} on. 

 under the influence of an atmosphere less arid. Future research must lead to the 

 settlement m|' such questions. The pubescence of the lower face of the leaves in all 

 has the peculiarity of seeming to he stellate or dendroid; but I think this 

 com,- about by a crossing of the hair- in tufts, rather than by an actual branching. 



