GREENE PTELEA IN THE u E IS l A M > SOUTHWEST. 69 



37. Ptelea laetissima Greene & Rose, Bp. nov. 



Twiga "i" the Beason <lull red-brown, lightly rugulose, puberulent, the older dull 

 brown, glabrate, smoothish: leaves small, of a light very bright green above, light 

 dull green beneath, with fain! trace of minute scattered hairiness on both faces, bul 

 to the unaided eye glabrous; odd leaflel lanceolate, acutish at both ends, about 5 cm. 

 long, the pair similar and hardly inequilateral, only about half as large, all sessile, 

 obsoletely crenulate: samaras large for the foliage, greenish in maturity, orbicular, 

 about L.8 cm. long and broad, truncate at base, emarginate at apex; body oval, of 

 Less than the width of the wing, prominently rugose, but the wrinkles nol very con- 

 tinuously transverse, punctuation nol strong; Btile and Btipe nearly equal, both slen- 

 der yet prominent 



Near Tehuacan, State of Puebla, Mexico, September, 1905, collected by Messrs. Rose, 

 Painter, and Rose no.9927 , type in the National Herbarium. The specimens being 

 at that date in fruit nearly matured, and with foliage bright and untarnished as if that of 

 early summer at the North, are evidence thai the species comes into leaf and flower 

 <»nly late in summer after the beginning of the rainy season. 



We have in the United States no Ptelea to equal this in the beauty of it- light 

 green almost brilliant foliage, a strong tinge of which is held by even the mature 

 fruit. 



38. Ptelea verrucosa, sp. nov. 



Twigs of the season greenish at maturity, verrucose-roughened with crowded short 

 rugosities each en. unci with a conspicuous gland, the intervening small furrows 

 with a few hair-, the older twigs smoother, straw-colored, glabrate but still low- 

 tuberculate: foliage vivid green above, paler beneath, stiffly subcoriaceous, strongly 

 punctate on both faces and with evident traces of pubescence; odd leaflet ovate above 

 an abruptly cuneate base, 4 to 6 cm. long, cuspidately pointed but the very apex 

 emarginate, the whole margin very lightly though not finely crenate: samara small 

 for the foliage, exactly orbicular, 1.3 to 1.5 cm. lorn:, quite as broad; body round- 

 obovate, broader than the wing, lightly circumvallate, coarsely reticulate ami pitted, 

 the glands many and evident; style prominent, more than twice as long as the very 

 short Btipe. 



Well marked Bpecies known in but a Bingle but very satisfactory specimen in the 

 collection of the old Mexican Boundary Survey, mounted on National Herbarium 

 sheet no. 624, along with fragments of three other species. No special locality is 

 indicated for any of the specimens. 



39. Ptelea ambigens, Bp. nov. 



Shrub, probably low, all the twigs and branches short, stoutish, flexuous, very leafy, 

 scarcely tuberculate and but lightly rugose in any stage, in all pale straw-color, L r la- 

 brous: leaves quite t irmly subcoriaceous, glabrous pale and glaucescent beneath, only 

 very obscurely punctate; middle leaflet obovate, -4 to 5 cm. long, abruptly cuneate at 

 base, acute at apex, the pair obliquely oval, smaller by one-half or one-third, all 

 more or less distinctly crenate: samaras suborbicular, mostly a trifle broader than 

 long, the width in the larger 2 cm. the length 1.8 cm., some smaller even a trifle 

 longer than broad and inclining to obovate; body oval, of less than the w idth of the 

 wing, with hut faint traces of transverse ridges, no circumvallation, bul copiously 

 dotted: style shorter than the stipe. 



The only specimen, hut that a very <_r« >< •< 1 one, i> from some unmentioned station 

 in southern Utah, and was collected by Dr. I".. Palmer as long ago as i- s 77. The 

 species is peculiar a- exhibiting along with the whitish and Bhining twL r s of this 

 group a foliage not s.» distinctly yellow-green, the lower face being quite glaucescent, 

 as in none of it- near allies. 



