Anyone have an idea what type of oak this might be? I'm from Australia, so I don't think we have any native oaks, so it should be a cultivated species.
I know this tree produces viable seed because I get 2 or 3 seedlings appear each year in my yard. However, I cannot find any large acorns. The acorns shown in the picture below with the jacaranda flower for scale, that is as large as they get. I have a covered area next to this tree so if there were any larger acorns there would definitely be some on the roof.
Tree has distinct bark. Other picture is of a growing seedling approx. 3 years old.
I can provide a picture of the mature tree if needed.
I don't recognize it, but the app says Notholithocarpus densiflorus.