62 OONTRIBUTTOira FRON THE NATIONAL HERBABIUM. 



and broad, Bubcordateat base, the obtuse Bummil conspicuously mucronate by the 

 long protruding Btyle-tip; bodyoi Leea than the width of the wing, the coarse, low 

 wrinkles somewhat radiating from its center. 



state of Coahuila, Mexico, known in a single specimen (National Herbarium), 

 obtained bj 1 >r. E. Palmer, in 1904, mixed with his no. 391, which is otherwise ref< 

 to /'. coahuih ru 



11. Ptelea scutellata, Bp. nov. 



Twigs of the season rugulose, puberulent, the older glabrate, nearly Bmooth: 

 leaves subcoriaceous, deep blue-green above and glabrous, beneath glaucescent and 

 obscurely puberulent; middle leaflet 4 to 5 cm. long, ovate t<> rhombic-ovate and 

 elliptic-lanceolate, acute, crenulate, laterals remarkably small, seldom more than 

 half as large, only slightly inequilateral and always narrow: Bamaras Bubquadrate- 

 obovate to Buborbicular, the more elongated 2 cm. long, the narrow base Bubcordate, 

 the broad apex obcordate, or at least retuse; body round-oval, not as wide as the 

 average width of tin- win-/, rugose-reticulate and impressed-punctate, not circum- 

 vallate; stipe prominent, style of equal length but obscure. 



Santa Eulalia Mountains, Chihuahua, Mexico, ( '. <;. Pringle, October -. 1886, his 

 ii". 940, as in National Herbarium. The specimens are in ripe fruit of a former 

 season, or else of the spring preceding, while at the October date of collecting full 

 clusters of flowers were in process of expansion. 



In the I [erbarium of John Donnell Smith is a specimen from the same mountains, 

 collected by E. Wilkinson, in L886, in the month of March, which is laden with 

 mature foliage and fruit as from the autumnal flowering. 



15. Ptelea cuspidata, >p. nov. 



Twigs of the season chestnut color, puberulent, the older glabrate, all rugulose: 

 leaves subcoriaceous, glabrous, bluish-green above, glaucous beneath, moderately 

 punctate; odd leaflet lanceolate, 5 to 7 cm. Long, acute or obtusish, evenly crenulate, 

 the pair of the same shape and from almost as large to barely one-third smaller, all 

 sessile: samaras broadly ovate-cordate to Buborbicular, 2 to l'.:: cm. lon^r, the width 

 the same, the base cordate or subcordate, the apex broadly and bluntly cuspidate, 

 also mucronulate by the short free portion of the style; body oval, much narrower 

 than the average width of the wing, coarsely and not prominently transverse-rugose 

 and rather closely punctate; stipe very short, style three times as long. 



Santa Eulalia Mountains, Chihuahua. March 1, 1885, E. Wilkinson, in mature 

 foliage and fruitaa from an autumnal flowering. Allied to P. scutellata, like it in 

 color and texture of foliage; both leaflets and fruits of different character. The only 

 specimens seen are in the National Herbarium, sheet L30319. 



16. Ptelea undulata, Bp. nov. 



Shrul) 4 m. high, with glabrous twigs almost verrucose-glandular and rugulose: 

 leaves subcoriaceous, nearly or quite glabrous, dull dark blue-green above, glauces- 

 cent beneath, densely puncticulate on both faces; middle leaflet elliptic or even 

 .somewhat rhombi-lanceolate, acute, »> cm. long, obscurely and unevenly crenulate, 

 the laterals similar and not much smaller: samaras Buborbicular, 2 cm. long and 

 broad, not Hat, the broad wing being lull and somewhat milled; body oval, circum- 

 vallate, the Btrong rugosity mostly broken into a reticulation inclosing many and 

 prominent gland-dots; stipe very short, style long, neither prominent 



Probably ol the Burro Mountains, southern New Mexico; Rusby's 111 as in the 

 National Herbarium, gathered .July 17, 1880. 



17. Ptelea cognata, Bp. nov. 



Twigs of the season chesl nut-color; glabrous and polished, warty-rugose, the short 

 ridges surmounted by a large gland: leaves on unusually long and Blender petioles, 



