Arizona Walnut 



221 



curved, sessile, the middle pairs slightly longest, blunt or sharp-pointed, rounded 

 or slightly heart-shaped at the base, or the terminal leaflet usually tapering at 

 the base, sharply saw-toothed on the margin, brownish green and scurfy when 

 unfolding, becoming membranous, Ught 

 green and smooth above, paler and 

 somewhat hairy at the junction of the 

 principal veins beneath. The stami- 

 nate flowers, opening from March to 

 May, are in slender loose haiiy catkins 

 5 to 7 cm. long; the bracts are brown- 

 ish hairy on the outer surface; the peri- 

 anth, also hairy, is 5- or 6-lobed ; stamens 

 30 to 40; anthers short, yellow, the 

 connective, prominently notched. The 

 pistillate flowers are terminal, spicate, 

 few together, ovoid, about 3 mm. long; 

 the stigmas are recurved, 12 mm. long 

 and yellow. The fruit is globose, 2 to 

 3.5 cm. in diameter with thin, brown 

 husk, finely hairy on the surface. The 

 nut is abnost globular, without ridges, 

 slightly compressed, usually flattened 

 at the base; the walls are thin, light 

 brown, with few shallow grooves; kernel sweet and remaining so for some time 

 before becoming rancid. 



The wood is hard, rather coarse-grained, dark brown, sometimes beautifully 

 mottled ; its specific gravity is about 0.63 ; it is used for fine cabinet work. The 

 tree is often planted in the Pacific States for shade and as a stock upon which to 

 graft the finer varieties of the European walnut; a hybrid with the latter has also 

 been obtained by cross-pollination. 



Fig. 180. — California Walnut. 



5. ARIZONA WALNUT — Juglans major (Torrey) Heller 

 Juglans rupestris major Torrey 



This tree is larger in all its parts than the Texan walnut and grows further 

 westward in New Mexico and Arizona, also in adjacent Mexico, occurring in 

 canons and on the mountains south as far as Durango. It attains a maximum 

 height of 15 meters, with a trunk diameter of 1.5 m. 



The trunk is rather short, soon dividing into stout, outspreading or pendulous 

 branches. The bark is about 2 cm. thick, deeply furrowed into ridges which break 

 into irregular, close, thin scales of a dark grayish color; that of younger stems is 

 smoother, gray to nearly white. The twigs are stout and pithy, covered with 

 brownish hairs, becoming nearly smooth, white, and bearing large triangular 



