70 COIfTEIBUTIONS FROM THE NATIONAL HEKBAKIUM 



40. Ptelea nitens, sp. nov- 



Slirub low, compact, donsely leafy and floriferous; twigs of the season light yel- 

 lowisli brown, ronglienetl by short ridges each bearing a low tubercular gland, deli- 

 cately puberulent or glabrous, the older oidy very light l)rowu, smooth, glabrate, 

 almost shining: leaves sn])coriaceous, light green, coarsely gland-dotted and glabrous 

 above, paler beneath and less glandular, obscurely pubescent along the mid vein; 

 odd leaflet 4 to 5 cm. long, rhombic-lanceolate, very acute or shortly acuminate, 

 fahitly cronate, the pair slightly inequilateral, nearly as large: samaras suburbicular 

 inclhiing to ovuidj Lo to 1*8 cm. long, subcordate, the apex obtuse or retuse, the 

 whole of firm hard texture and somewhat polished, body oval and very long in 

 proportion, circumvallate, strongly wrinkled but irregularly rather than transversely, 

 the glands few and not prominent;- style greatly elongated, stipe very short, ahnost 

 obsolete. 



Canyon of the Arkansas River above Canon City, Colorado, July, 1892, Miss 

 Eastwood, the type in the Herbarium of the California Academy, in copious fruit. 

 The species was collected by myself in the same canyon in 189G, but in leaf only, no 

 fruit seen, A specimen in young fruit, taken in June, 1892, by Mr. J. II. Cowen at 

 Florence, well down the Arkansas Valley toward the plains, may also belong here; 

 but the bark in this is straw-oolored and the immature foliage abruptly rather Inng- 

 acuminato. 



41. Ptelea pallida, pp. nov. 



Twigs of the season of a light yellowish-brown, puberulent, elongated-rugose, hardly 

 glandular, those of a former season glabrate, light ash-gray, low-rugosi^: leaves not 

 large, rigidly subcoriaceous, dull pale green above, beneath still paler and glances- 

 cent, both faces glabrous except as to more traces of short pubescence on the veins 

 and margin; odd leaflet elliptic-lanceolate, 3.5 to 5.5 cm. long, lateral itair one-half 

 to three-fourths as large, obliquely ol>!ong-laneeolate, all minutely crenate-aubserru- 

 late, the petioles 3.5 to 4,5 cm, long and reinarkably slender: samaras large for the 

 foliage, 1,5 to 2 cm. long, almost exactly orbicular, very obtuse or almost truntrate at 

 each en<l; body oval, of less than the width of the wing, not distinctly circum vallate, 

 the ridges low, seldom definitely transverse^, usually of a sinuous irregularity and 

 with few large gland-dots interspersed; wing smoothish, the reticulation low; style 

 long, stipe half as long, both prominent. 



Arid rocky hills above Peach Springs, northern Arizona, collected by the M'riter 

 July 3, 1889; type in the National Herbarium. The species is peculiar, not easily 

 associated with any group. 



42. Ptelea strarainea, s^^* ^ov. 



Fruiting twigs short, fetout, ahnost divarii-ate or a little recurved, straw-colored 

 and det^])ly so, almost yellowish, delicately puberulent, faintly rugulose, almost 

 glandless, the dots few, low, obscure, tlu; bark of older twigs whitish, glabrate, 

 smootli and polished: leaves not thi(*k, hardly suboriaceous, of almost the same 

 bright light green on both faces, everywhere g!abroup, only faintly and sparsely 

 punctate; o<ld leaflet obovate, 4 to 6.5 cm. long, acute at base, obtuse at apex, defi- 



nitely and not finely crenate, the laterals often quite similar scarcely smaller, some- 

 times smaller by one-third and acute but selrkim at all inequilateral: samaras large, 

 of suborbicular outline but broader than long, the width fully 2 cm,, strongly both 

 cordate and obcordate, the whole being thus somewhat 2-lobed; body (jrbicuUir and 

 central, of much less than the width of the wing, only fahitly low-rugose, very 

 notably and densely glandular. 



Eocky slopes of the Virgin Mountains in extreme northwestern Arizona, C. A. 

 Purpus, 1898; his no. 0105 as in the National Herbarium. In the foliage ami fruit 

 there are suggestions of affinity between this and tlie Californian members of the 



