We found these oaks to be not infrequent in the Stony Brook Reservation and elsewhere around Boston. They look like Q. prinus with "abnormal," sparse and large, deeply incised leaf denticles. This oak has only 6-8 lobes of nearly equal size on each side of the leaf. Q. prinus would have some 10-16 rounded, more or less pronounced denticles forming a crenate margin.