134 



TREES OF NORTH AMERICA 



irregularly dentate, inclosing to the middle the long stalked ovary full and rounded at apex, 

 with 3 broad crenulate lobed stigmas raised on the short branches of the style. Fruit 

 oblong-ovoid, thick-walled, acute, 3 or 4-valved, slightly ridged, buff color, |' long; pedi- 

 cels slender, '-f ' in length and placed rather remotely on the slender glabrous rachis of 

 the ament. 



A large tree, with wide-spreading branches, and stout light orange-colored glabrous branch- 



Fig. 128 



lets. Winter-buds acute lustrous, puberulous. Bark pale gray-brown, deeply divided 

 into broad flat ridges. Wood used as fuel, for fence-posts and the rafters of Mexican 

 houses. 



Distribution. Western Texas through New Mexico to the valley of Grand River, west- 

 ern Colorado (Grand Junction, Mesa County); common in the valley of the Rio Grande 

 in western Texas and New Mexico, and the adjacent parts of Mexico. 



Often planted as a shade tree in New Mexico. 



13. Populus Sargentii Dode. 

 Popidus deltoides var. occidentalis Rydb. 



Leaves ovate, usually longer than broad, abruptly narrowed into a long slender entire 

 acuminate point or rarely rounded at apex, truncate or slightly cordate at base, and 

 coarsely crenately serrate, as they unfold slightly villose above and tomentose on the mar- 

 gins, soon glabrous, light green and very lustrous, 3'-3|' long, 3|'-4' wide, with a thin mid- 

 rib slender primary veins and reticulate veinlets occasionally furnished on the upper side 

 at the insertion of the petiole with one or two small glands; petioles slender, compressed 

 laterally, 2'-3' long. Flowers: aments short-stalked, glabrous, the staminate 2,'-ZV in 

 length, the pistillate becoming 4 '-8' long before the fruit ripens; scales fimbriately divided 

 at apex, scarious, light brown; disk of the staminate flow r er broad, oblique, slightly thickened 

 on the margins; stamens 20 or more, with short filaments and yellow anthers; disk of the 

 pistillate flower cup-shaped, slightly lobed on the margin; ovary subglobose, with 3 or 4 

 sessile dilated or laciniately lobed stigmas. Fruit oblong-ovoid, gradually or abruptly 

 narrowed to the blunt apex, thin-walled, about f- ' long and three or four times longer than 

 the pedicel; seeds oblong-obovoid, rounded at apex, about T V in length. 



A tree 60-90 tall with a trunk often 6 or 7 in diameter, erect and spreading branches 

 forming a broad open head, and stout glabrous light yellow often angular branchlets 

 conspicuously roughened by the elevated scars of fallen leaf-stalks. Winter-buds ovoid, 



