PLATE LXVIII. BLACK JACK OAK. 



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



(i) immature acorns, x J. 



2. Branch with mature leaves, immature and mature acorns, x i. 



3. An acorn cup, x J. 



4. An acorn, x 1. 



5. Winter twit; with immature acorns, buds, and loaf-scars, x J. 



6. Section of a winter twig, enlarged. 



