Valmiki Ramayana Ayodhya Kanda Sarga 33 Shloka 15

धर्मसारः the essence of dharma, महाद्युतिः effulgent, एषः this Rama, मनुष्याणाम् of humanity, मूलं हि is root indeed, इतरे other, जनाः people, अस्य Rama's (like the trunk of a tree), पुष्पम् flower, फलं च fruit as well, पत्रं च leaf also, शाखाश्च branches.

Effulgent Rama personifies the essence of dharma. He is the root of (the tree of) humanity. The other people are connected with this tree like flowers, fruit, leaves and branches.