TO CONTRIBUTIONS FROM THE NATtONAL HERBARIUM. 



40. Ptelea nitena, sp. nov. 



Shrub low, compact, densel) leafy and fioriferous; t \\ i-_ r - of the Beaaon light yel- 

 lowish brown, roughened by Bhort ridges each bearing a low tubercular gland, deii- 

 cately puberulenl or glabrous, the older only very light brown, smooth, glabrate, 

 almost Bhining: leaves subcoriaceous, light green, coarsely gland-dotted and glabrous 

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

 odd Leaflet 4 to •"> cm. l"ii'_ r . rhombic-lanceolate, very acute or Bhortly acuminate, 

 faintly crenate, the pair slightly inequilateral, uearly as large: samaras suborbicular 

 inclining to ovoid, 1.5 to L.8 cm. long, subcordate, the apex obtuse or retnse, the 

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

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

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

 obsolete. 



Canyon of the Arkansas River above (anon City, Colorado, July, L892, bliss 



I'.a-tu 1. tlie type in the Herbarium of the California Academy, in copious fruit 



The Bpecies was collected by myself in the same canyon m L896, but in leaf only, no 

 fruit seen. A specimen in young fruit, taken in June, L892, by Mr. .1. II. Cowen at 

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

 hut the bark in this i- straw-colored and the immature foliage abruptly rather long- 

 acuminate. 



41. Ptelea pallida, sj>. nov. 



'l'w iu r s of the season of a light yellowish-brown, puherulent, elongated-rugose, hardly 

 glandular, those «.f a former season glabrate, light ash-gray, low-rugose: leaves not 

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



cellt, both faces glabrOUS except as to mere traces of short pubescence On the veins 



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

 to three-fourths as large, obliquely oblong-lanceolate, all minutely crenate-subserru- 

 late, the petioles 3.5 to 4.5 cm. long and remarkably slender: samara- Large for the 



foliage, 1.5 to - cm. Long, almost exactly orbicular, very obtuse or almost truncate at 

 each end; body oval, of Less than the width of the wing, not distinctly circumvallate, 

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

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

 Long, stipe half as lon.L r , both prominent. 



Arid rocky hills above Peach Springs, northern Arizona, collected by the writer 

 .Inly ."», L889; type in the National Herbarium. The species is peculiar, not easily 

 associated with any group. 



42. Ptelea straminea, sp. nov. 



Fruiting twigs Bhort, stout, almost divaricate or a little recurved, straw -colored 

 and deeply so. almost yellowish, delicately puherulent, faintly rugulose, almost 

 ^landless, the dots few, low. obscure, the bark of older twigs whitish, glabrate, 

 smooth and polished: leaves not thick, hardly BUboriaoeouS, of almost the same 

 bright light green on both faces, everywhere glabrous, only faintly ami sparsely 

 punctate; odd leaflet obovate, I to 6.5 cm. long, acute at base, obtuse at apex, defi- 

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

 times smaller by one-third and acute but seldom at all inequilateral: samaras Large, 

 of suborbicular outline but broader than Long, the width fully 2 cm., Btrongly both 

 cordate and obcordate. the whole being thus somewhat L'-lohed; body orbicular and 

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

 notably and densely glandular. 



Rocky slopes of the Virgin Mountains in extreme northwestern Arizona. ( '. A. 

 Purpus, L898; his no. 6165 as in the National Herbarium. In the foliage and fruit 

 there are suggestions of affinity between this and the California!! members of the 



