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r^ 



w-- 



■^ -- . . 



k 



gr>:p:nk — ptklea tn the WEf^T and southwest, 69 



37. Ptelea laetissima ( Jrocne & Rose, pp. nov. 



TwigH of the season dull red-brown, Hglitly rntrulor^e, puberulent, the older dull 

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

 dull green beneath, witli faint trace of minute scattered hairiness on both faces, l)ut 

 to the unaided eye ghibrou^; odd leaflet lanceolate, acutisli at both ends, about 5 cm. 

 long, the pair similar and hardly ine(inilateral, only about Iialf as large, all sessile, 

 obsuletely crenulate: samaras large fur the foliage, greenish in maturity, orbicular, 

 idjout 1.8 cm. long and l>road, truncate at base, emarginate at apex; body oval, of 

 less than the width of tlu^ wing, promincnitly rugose, but the wrinkles not very con- 

 tinuously transverse, punctuation not strong; stile and stipe nearly equal, both slen- 

 der yet prominent. 



Near Tcliuacan, State of 1 *nrbla, Mexico, September, 1905, collected by Messrs. Rose, 

 Painter, and Rose (no. 9927), type in the National Herbarium. The specimens l>eing 

 atthatdateinfruitnearly matured, and with fuliage bright and untarnished as if that of 

 ly summer at the Xorth, are evidence that the species con:ies into leaf and flower 

 only late in aumnu^r after the beginning of the rainy season. 



We have in the United States no PteU^a ti> equal this in the beauty of its liglit 

 LTcen almost brilliard foliage, a strong tingt^ of which is held by even the mature 

 fruit. 



38. Ptelea verrucosa, sp. nov. 



Twigs of the season greenish at maturity, verru cose- roughened with crowded sliort 

 rugosities each crowned with a conspicuous gland, the intervening small furrows 

 with a few hairs, the older twigs smoother, straw-colored, g!a1)rate but still low- 

 tuberculate: f<jUage vivid green above, i»aler beneath, stiffly su}jcoriaceous, strongly 

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

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

 emarginate, the wliole margin very lightly tlioiigh not finely eremite: samara small 

 for tlie foliage, t^xactly orbicular, 1.3 to 1.5 cm. long, quite as broad; body round- 

 obovate, broader than the wing, lightly circum vallate, coarsely reticulate and pitted, 

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



short stipe. 



Well marked species known in but a single but very satisfactory specimen in the 

 collection of the old Mexican Boundary Suiwey, mounted on National lh^r])arium 

 sheet no. C24, along with fragments of three other si)ecies. No special locality is 

 indicated for any of tlie specimens. 



39. Ptelea anibigens, sp. nov. 



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

 scarcely tuberoulate and but lightly rugose in any stage, in all pale straw-color, gla- 

 brous: leaves quite firmly subcoriaceous, glabrous ]>ale and glaucescent beneath, only 

 very obscurely i)unctate; middle leaflet ob<»vate, 4 to 5 cm. long, abruptly cuneate at 

 l)ase, acute at ai>ex, the pair obliipiely (»val, 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 L8 cm., some smaller even a trifle 

 longer than broad and inclining to ol>ovate; body oval, of less than the width of the 

 wing, with but faint traces of transverse ridges, no circumvallation, but copiously 



dotted; style shorter than the stipe. 



The only specimen, but that a very good one, is from some unmentioned station 

 in southern Utah, and was collected by Dr. E. Palmer as long ago as 1877. The 

 species is peculiar as exhibiting along with the whitish and shining twigs of this 

 group a foliage not so distinctly yellow-green, the lower face being quite glaucescent, 

 as in none of its near allies. 



