GREENE PTELEA IX THE WEST AND SOUTHWEST. 61 



10. Ptelea subintegra, sp. nov. 



Twigs of tin- season pubescent, hardly regulose, the older and glabrate branches 

 very dark brown and nearly smooth: foliage extremely pale on both faces, glaucous 

 and with sparse pubescence above, almost white beneath with both bloom and 

 villous-tomentulose indument, texture no thicker than membranaceous; middle 

 leaflel ovate-elliptic, 4 to 5 cm. long, the pair marly as large, obliquely oval 

 sessile, subentire, -can-fly acute: samaras of middle size, much broader than long, 

 the breadth 2 cm., the length L.5 cm., cordate at base, obcordate at summit; body 

 round-obovate, of much less than the width of the \vhr_r. not circumvallate, the 

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

 and she irt. 



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

 where it was gathered byDr. E. Palmer in L896, the label of the type specimen in 

 the National Herbarium bearing the collector's number 846. 



11. Ptelea coahuilensis. sp. nov. 



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

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

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

 tuation; odd leaflet 4 to 5 cm. long, narrowly cuneate-< ibovat • and obtuse to rhomboid 

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

 otherwise similar, few being notably inequilateral: samara- large, orbicular, 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 befng Prin- 

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

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

 exactly like it. Palmer - 391 in the National Herbarium, from San Lorenzo < 'anyon 

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

 age, an<l 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 branches stouter and rigid, as well as densely leafy and fructiferous, 

 during the first season grandular, warty, and pubescent: leaves almost coriao 

 dark blue-green above, glaucescent beneath, with traces of short scattered hairs on 

 both faces, and punctuation 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 crenulate margin at length rev. -lute, the leaflet thus seeming 

 entire, the pair similar but of all Bizes: Bamaras large, round-oval, 1.2 to 1.5 cm. 

 long, the breadth notably less, obtuse at both end-: body large in proportion and 

 much elongated, long-oval, of almost or quite the width of the wing, broadly low- 

 rugose transversely and somewhat circumvallate, dots most obscure; style and 

 stipe equal, and both short. 



Known to me only as collected somewhere in Coahuila, Mexico, in l ss <>. by Dr. 

 K. Palmer, his no. 14»ia< in the National Herbarium. 



13. Ptelea pumila, sp. nov. 



Evidently dwarf, the very short twigs of tin- 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; odd leaflet 

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

 bu ben tire: samaras larger than the leaves, mostly orbicular and nearly 2 cm. long 



