GKKKNE PTELEA IN THE WEST AND SOUTHWEST. 61 



10. Ptelea subintegraj S]\ imv. 



Twigis of the 8ea.son [)ube.scent, hardly regulose, th*_' older and glabrate branches 

 very dark brown and nearly smooth: foliage extremely i>ale on both facei^, glaucons 

 and ^vith sparse pnbescenee above, almost wliite beneath with both bloom and 

 villons-tomentulose indnmrnt, texture no thicker than membranaceous; middle 

 leaflet ovate-elliptic^ 4 to 5 cm. long, the pair nearly as large, obliquely ovate, all 

 ses^-ile, eubentire, scarcely acute: samaras of middle size, much broader than long, 

 the 1)readth 2 cm., the length 1.5 cm., cordate at base, obcordate at summit; body 

 round-obovate, of much less than the \vi<lth of the wing, not circumvallate, the 

 transverse ridges few, broad and low, dots few but obvious; style and stipe equal 

 and short. 



A fine species known only fnun somewhere in the vicinity of Durango, Mexico, 

 where it was gathered byDr. K. Palmer in 1S0(>, the label of the type specimen in 

 the National Herbarium bearing the collector's number S4G, 



11. Ptelea coahuilensis, sj). nov. 



Twigs of the season glabrous, chestnut-color, densely glandular-verrucose, the older 

 less prominently so, but color the same: leaves small, subcoriaceou>, glabrous, glau- 

 cous on both faces, most so beneath, and there with but the faintest trace of punc- 

 tuation; odd leaflet 4 to 5 cm. long, narrowly cuneate-obovat.* and obtuse to rhomboid 



I r 



and acutish, subentire to quite crenulate, the pair one-half to two-thirds as large, 

 otherwise similar, few being nntaltly inequilateral: samaras large, orlncular, 2 cm. in 

 length and breadth, seldom emarginate at either end; body oval or suborbicular; of 

 much less than the width of the wing, the transverse ridges broad, low and obscure; 

 style longer than the stipe. 



Specimens seen only from the State of Coahuila, Mexico, the typical being IVin- 

 gle's number 1937, collected in July, 1888, as found in the National Herbarium. 

 The sheets of the same collection in the llerljarium of John Donnell Smith are 

 exactly like it. l*almer's 81)1 in the Xational Herbarium, from San Lorenzo Canyon 

 near Saltillo I take to be in part the same, though with broader and crenate foli- 

 age, and with several of the large samaras three-winged. But there is a very differ- 

 ent species mixed with this under that number, 391 of Dr. E. Palmer. 



12. Ptelea obtusata, sp- nov. 



Twigs and l>ranches stouter and rigid, as well as densely leafy and fructiferous, 

 during the first season grandular, warty, and pubesc(^nt: leaves almost coriaceous, 

 dark blue-green above, glancescent beneath, Avith traces of short scattered hairs on 

 both faces, and i>unctuation almost obsolete; odd leaflet 3 to 4 cm. long, very broad 

 above an abruptly attenuate base, the outline from round-obovate very obtuse, to 

 rhomboid-ovate, a finely crenidate margin at length revolute, the leaflet thus seeniing 

 entire, the pair similar but of all sizes: sainaras large, round-oval, 1.2 to L5 cm. 

 long, the brea<lth notably les-^, oljtuse at both ends; body large in proportion and 

 niuch elongat(Ml, long-oval, of almost or (juite the width of the wing, broadly low- 

 ruerose transverselv and somewhat circumvallate, dots most obscure; stvle and 

 stipe equal, and both short. 



Known to me only as collected somewhere in Coahuila, Mexico, in 1880, by Dr. 

 E, Palmer, his no. 146 as in the National Herbarium. 



13. Ptelea pumila, sp. nov. 



Evidently dwarf, the very short twigs of the season tuberculate, puberulent, 

 leafy with small leaves, the flowers few, some solitary: leaves greatly reduced, pale 

 and alike glaucous on both faces, also with traces of minute hairiness; odtl leaflet 

 oblong-obovate, very obtuse, barely 1.5 cm. long^ the parr half as large, oval, all 

 subentire: samaras larger than the leaves, mostly orbicular and nearly 2 cm. long 



