322 



TREES OF NORTH AMERICA 



mary veins, 2'-2|' long, l'-2' wide; petioles stout, slightly pubescent, \'-\' in length. 

 Flowers on slender, pubescent pedicels; calyx divided into five linear acute scarious lobes 

 laciniately cut at apex; torus hoary-tomentose. Fruit on slender drooping slightly pu- 

 bescent or glabrous pedicels, \'-\' in length, subglobose to ellipsoid, light orange-brown, 

 lustrous, \' in diameter. 



A small tree or shrub rarely more than 20' high, with slender slightly pubescent or gla- 

 brous red-brown branchlets marked by small pale lenticels, becoming ashy gray in their 

 second or third year. Bark rough, red-brown or gray. 



Distribution. Dry hillsides and rocky river banks; eastern Oregon from the valley of 

 the Deschutes and Columbia Rivers to the canon of Snake River, Whitman County, 

 Washington, and to Big Willow Creek, Canon County, western Idaho; on the western foot- 

 hills of the Wasatch Mountains, in the canon of Grand River, and in Diamond Valley, 

 Utah; southern California, near Independence, Inyo County, Hackberry Canon, Kern 

 County, and Things Valley at base of Laguna Mountain, near Campo, southern San 

 Diego County; on Cedros Island, and in northern Lower California; rim of the Grand 

 Canon, Arizona, and on the eastern foothills of the Rocky Mountains of Colorado. 



Occasionally planted in the towns of western Washington, and when cultivated said to 

 grow in good soil into a larger and more shapely tree with thinner leaves. 



3. Celtis Lindheimeri K. Koch. Palo Blanco. 

 Celtis Helleri Small. 



Leaves oblong-ovate, acuminate or acute, cordate or obliquely cordate or rounded at 

 base, entire, or crenately serrate on vigorous shoots, rough above, pale and clothed below 

 with white hairs, becoming by midsummer thick and covered below with a conspicuous 

 network of reticulate veinlets, H'-3' long, f'-2' wide; petioles densely villose-pubescent, 



Fig. 293 



|'-|' in length. Flowers opening toward the end of March on pubescent pedicels; calyx 

 divided into five oblong scarious lobes narrowed and rounded at apex; torus tomentose. 

 Fruit on slender tomentose stems i'-f ' long, ripening in September and persistent on the 

 branches until spring, subglobose to ellipsoid, dark reddish brown, lustrous, j' in diameter. 



