Mandarin orange (tachibana)
橘 tachibana

An evergreen citrus believed to be the fruit of eternal youth, so it stands for longevity and prosperity; formal and celebratory.
Native wild citrus; Tajimamori legend in the Kojiki and Nihon Shoki (8th century)
In the chronicles, Emperor Suinin sent Tajimamori to the eternal land of Tokoyo for the 'ever-fragrant fruit' (tokijiku no kagu no konomi). He returned after ten years to find the emperor dead; the fruit is identified as tachibana. Tajimamori is still revered as the god of sweets. The evergreen tachibana appears in early Japanese poetry and became a crest of the noble Tachibana family.
A tachibana tree stands before the Shishinden of the Kyoto Imperial Palace, and the motif is used on formal and wedding kimono and Hina doll displays.