JUGLANDACE^E 



131 



branches forming a graceful symmetrical round-topped head, and slender branchlets 

 covered while young with rufous scurfy tomeutum, dark reddish brown, puberulous, 

 and marked during their first winter with pale scattered lenticels and small elevated 

 obscurely 3-lobed leaf -scars, becoming darker and gradually glabrous in their second 

 year and ultimately nearly white; often much smaller, sometimes shrubby in !fkbit. 



"Winter-buds: terminal acute, compressed, more or less oblique at the apex, coated 

 with pale tomeutum, \' long; axillary usually solitary, nearly globose, ^ ff ' long, and 

 covered with thick pale rufous tomentum. Bark of young stems and upper branches 

 smooth, pale or nearly white, becoming on old trunks ^'-^' thick, dark brown or 

 nearly black, deeply divided into broad irregular ridges separating on the surface 

 into thin appressed scales. Wood heavy, hard, rather cross-grained, dark brown, 

 often mottled, with thick pale sapwood of 8-10 layers of annual growth. 



Distribution. Banks of streams and bottom-lands in the California coast region, 

 usually twenty or thirty miles from the sea, from the valley of the lower Sacramento 

 River to the southern slopes of the San Bernardino Mountains. 



Often cultivated in California as a shade-tree and as stock on which to graft 

 varieties of Juglans regia, L. 



2. HICORIA, Raf. Hickory. 



Trees, with smooth gray bark becoming on old trunks rough and scaly, strong 

 hard tough brown wood, tough terete flexible branches, solid pith, buds covered with 

 few valvate or with numerous imbricated scales, the axillary buds often stalked and 

 sometimes solitary. Leaves often glandular-dotted, their petioles sometimes per- 

 sistent on the branches during the winter, and in falling leaving large elevated ob- 

 long or semiorbicular more or less 3-lobed emarginate leaf-scars displaying small 

 marginal clusters and central radiating lines of dark fibro- vascular bundle-scars; 

 leaflets, involute in the bud, ovate or obovate, usually acuminate, thick and firm, 

 serrate, mostly unequal at the base, with veins forked and running to the margins, 

 turning clear bright yellow in the autumn. Aments of the staminate flowers ternate, 

 slender, solitary or fascicled in the axils of leaves of the previous year or at the base 

 of branches of the year from the inner scales of the terminal bud, the lateral branches 



