GO COTTTHriiUTIONS FEOM THE ^^ATIONAL HERBARIUM. 



1.5 cm. wide, varying from orl)irular toward ov;itej only obtuse at base, the apex 

 t'lnarginate; body oval, botb large and thirk in proportion to the wing, the width of 

 the two about eqnal, neither cMrcunivallate nor tlie ri<lgeH rnnnin<,^ c'roaswitee, but 

 mof^tly broken into reticulation, gland-dots mostly few and rather obscure; styleako 

 quite ob^^cure, longer than the stipe^ this more obviini^. 



Sierra Jihmiv^, New Mexico, August 17, 1897, at 2,120 meters, collected by K. O. 

 AVooton and by him distributed under no. 057, at least a,< in my herbarium, Avhere 

 the only specimens kntjwn tome are pi-e:served. It is manifestly allied rather closely 

 to P. villtj.97iJa of the Organ Momitaina, but has a very different tliin, large, and 

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

 and j)aler on both faces. I suppose by the foliage that its habitat must be in deep 

 shaded canyons, where the air is moist from the spray of ^^treama. 



8* Ptelea villosula, sp. nov. 



Twi<^s of the season slender, chestnut-color, almost or quite glabrous, short-rugu- 

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

 naceous but not subcoriaceous, glancescent above an<l nearly glabrous, beneath 

 wliitened by bloom and a white villous short pubescence; odd leaflet broadly 

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

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

 ingly inequihitcral: samaras large in proportion to the foliage, 1.2 to 1.8 cm. long, 

 ahnost as broad, usually subqnadrate-orbicular, being broadly truncate at both ends; 

 body neither large nor tliick as compared with the wiiig, oval, coarsely and more or 

 less transversely rugose, with or without a trace of circumvahation, tlie gland-dots 

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



Known only from the isolated Organ Mountains of southern New Mexico, as 

 collected July 11, 1897, by E. 0* Wooton, who distributed excellent fruiting sijcci- 

 mens under no. 134, as in my herbarium (type) and the National Herbarium. 



From the small -^ize and rather firm texture of the foliage I infer this to be an 

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

 mountains; but the collectors never vouschafe the least information upo!i these 



im})ortant matters. 



9. Ptelea tortuosa, sp. nov. 



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

 lent, the ohler dull dark brown, glabrate: mature friliag(^ quite firm but not subcori- 

 aceous, pate-green, glabrate and punctate above, glaucus and whitinh-tomentulose 

 beneath; odd leaflet 8,5 to 6 cm. hmg, ovate above a short tapering base, hardly 

 acute at apex, lightly and unevenly crenate; the pair variously snmlU^r, obliqu<4y 

 oval, obtuse at both ends, more distinctly crenate, all sessile: samara suborl)icular 

 but broader than long, the witlth 1.5 cm., broad and subtruncate at botli ends; 

 body round-oval, nearly central, not circumvallate, alxAit as wide as the wing, ridges 

 low, more or less transverse and unbroken, gland-duts tibvious only untler a lens. 



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

 August 10, 1901, no. 5822 as in the National Herbarium. 



The type specimens have the appearance of a low shrub of poor and arid soil. 

 But from the same neighborhood there are before me two sheets, one by Mr. Ilcllcr, 

 the other from Dr. ^IcDougal, both young and immature fruit, whi(*h have the 

 apj)earance of a different species; an<l in the first draft of tiiis paper I had named 

 and described theni as such, Tlic leaves are broader, larger, thinner, less i>ubescent 

 beneath, etc., Init they may possibly represent P. tortuos<t :\^ grown in a sha<ly canyon, 

 under the influ^L'nce of an atmosjdiere less arid. Future rcirearcli must lead to the 

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

 these has the peruliaritv of seeming to be stellate or dendroid; but I think this 

 comes alxnit by a crossing of the hairs in tufts, rather than by an actual branching. 



