^1 



PLATE LVII. BUR OAK. 



1. Flowering branch with iuiiiiature leavfs. <s) staniinate Mossonis, (p) pistillate blosso.tis. % 4 



2. Branch with mature leaves and mature acoros, x i 



3. An acorn cup, x i. 



4. An acorn, x J. 



5. A winter branch showing buds, leaf-scars, and raised ^-orky ridges, x i. 



6. Terminal section of winter branch showing bud with overlapping si-alet- and leaf scar with 



bundle-scars, enlarged. 



7. Basal bud-scaU* with haii-y margin, enlai^ed. 



S. Apical bud-scale with hairy serrate margin, enlarged. 



