Linked from
The 15 pages that link to Oak, each with the reason it gives.
MonoecyBroader topic: Oak catkins and female flowers provide a woody-plant example of monoecy.
CatkinBroader topic: Oaks bear slender male catkins that shed pollen.
FagaceaeBroader topic: Oaks are the most diverse and widely recognized genus in Fagaceae.
FagalesBroader topic: Oaks supply timber and support food webs built around their acorns.