r 



58 CONTRIBUTIONS FROM THE "NATIONAL HERBARIUM. 



r. 



Said to be common along tlie White River near Eagle Rock, in extreme south- 

 western Missouri, where it was collected June 21, 1897, by B. F. Bush, his no. 171 

 as in National Herbarium. One would expec't it in adjacent Arkansas. 



■ 



2. Ptelea isophylla, sp. nov. 



Twigs of the season light chestnut-color, glabrous, sharply rugose, obscurely glan- 

 dular, the older dark brown, smooth: leaves tliin, of a light dull glaucescent-green 

 on both faces and both with traces of pubescence, only the upper minutely and 

 inconspicuously gland-dotted; odd leaflet ovate to rhombic-ovate, 4 to 6 cm. long, 

 abruptly obtuse-pohitcd, subentire, the pair seldom smaller, sometimes even larger, 

 relatively broader, scarcely inequilateral: samara very large for the foliage, 2 to 2.5 

 cm. long, nearly as wide, suborbicular but with obcordate summit and subcordate 

 base; body round-oval, of less than the width of the wing, circumvallate, the trans- 

 verse rugosity close but low and not very distinct, the whole only obscurely gland- 

 dotted; stipe nearly twice as long as the style, both slender. 



Known to me only as collected by Mr, B. F. Bush, June 8, 1898, from woods in 

 the vicinity of Swan, Missouri. The type sheet in the National Herbarium has Mr. 

 Bush's no. 211. The species is next of kin to my P. mesochora of the upper 

 Mississippi region/^ 



3. Ptelea prominula, sp. nov. 



Perhaps a low or small shrub, the twigs small, with short internodes and pubes- 

 cent: leaves small, dull-green, pubescent be'neatli, less so above; odd leaflet broadly 

 obvoate, 4 to 4.5 cm. long, 2 to 2.5 cm. wide above the middle, all subentire, very 

 shortly cuspidate at apex, the pair of laterals not nmch smaller, round-ovate: sama- 

 ras suborbicular, small, 1.5 to 1.7 cm. long, very nearly as broad, subcordate at base, 

 retuse at apex, the body of about the width of the wing, faintly dotted but strongly 

 and prominently transverse-rugose and circumvallate, tlie reticulation of the wing 

 unusually elevated and prominent, as also the subequal style and stipe, even these 

 connected by a sharp ridge pervading whole length of the body of the fruit. 



Known to me in but a single twig in mature fruit, purporting to have been collected 

 on a creek bank near Austin, Texas. May 9, 1872, by Elihu Hall, the label bearing 

 his distribution number, 74; but on tlie same sheet in the National Herbarium, and 

 under the same label, occur two other twigs, both of 1\ rhombifolia, and with fruit 

 very young, not half grown. 



The wing of P. prominula is wavy rather than plane, and the elevated character of 

 the wrinkles and reticulations is peculiar. 



4. Ptelea wrig-htiana, sp. nov. 



Twigs of the season short, slender, pubescent, and regulose: leaves not small, 

 very thin, dull bluish-green, finely but scantily pubescent on both faces; middle 

 leaflet elliptic-obovate, 5 to 8 cm. long, the pair obliquely ovate, only Jialf as large, 

 all merely acutish, subentire: samaras very large, round-oVal, 2.5 cm. long, 2.2 wide, 

 obtuse at both ends; body round-oval, of much less than the width of the wing, not 

 obviously either punctate or circumvallate, but the transverse wrinkles sharply 

 prominent, as also the reticulation of the wing; style and stipe equal, both very 

 long, rather prominent. 



Turkey Creek, western Texas, June, 1849, Charles Wright, no, 82 as in the Na- 

 tional Herbarium. Referred to in Gray, Plantar Wrightianee. 'J 



I also refer liere provisionally a sheet of specimens collected by Jermy in western 

 Texas, near San Antonio. It has similar fruits, the foliage differing in that it is of 



n 



firmer texture, and the outline of leaflets narrow, being elliptic-lanceolate. The 

 label bears no date. 



^Torreya 5: 100. 1905. ^Part 1, p. 31. 



