Michigan Trees: A Handbook of the Native and Most Important Introduced Species
d. Cup of acorn top-shaped or cup-shaped, inclosing one-third
to one-half of the nut.
e. Kernel of nut yellow; buds glabrous, lustrous, slightly angular; inner bark of trunk yellow; trunk provided with pins or stubs of dead branches near the ground. _Q. ellipsoidalis_, p. 115.
ee. Kernel of nut whitish; buds pubescent above the middle, not angular; inner bark of trunk red; trunk not provided with pins or stubs of branches near the ground. _Q. coccinea_, p. 113.