楠 — camphor tree

しかし、授業を疎かにしたうえ、「楠多聞丸」と大書した旗を掲げて合戦の真似事ばかりした。

However, he not only neglected to give lessons, but also did nothing but mock battles, flying a flag with large letters of "Tamonmaru KUSUNOKI" (childhood name of Masashige KUSUNOKI, known as a paragon of fidelity) written on it.