PLATE LVII. BUR OAK. 



1. Flowering branch with immature leaves, (s) staminate blossoms, (p) pistillate blossoms, x J. 



2. Branch with mature leaves and mature acorns, x h 



3. An acorn cup, x J. 



4. An acorn, x j. 



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



6. Terminal section of winter branch showing bud with overlapping scales and leaf scar with 



bundle-scars, enlarged. 



7. Basal bud-scalo with hairy margin, enlarged. 



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



