Ligustrum japonicum Thunb.

Family: Oleaceae
English: Japanese Privet
Japanese: ネズミモチ (鼠黐) [Nezumi Mochi]

I like the shape of the leaves, but it's easy to ignore this tree until it started blooming. Then the fragrant flowers attract many insects.

References:
九州野山の花 片野田逸朗,2004：南方新社
米倉浩司・梶田忠 (2003-)　「BG Plants 和名－学名インデックス」（YList），http://ylist.info（ 2019年8月14日）