The roboku (路木) is the riboku located at the heart of the Imperial Palace. The riboku is first described in chapter 53 of Shadow of the Moon. New species of plants can essentially be bioengineered via the roboku. In the wild, they also spontaneously evolve new plants and flowers on their own, as Rangyoku explains in chapter 33 of A Thousand Leagues of Wind.

Labels: 12 kingdoms, hisho