Regalis V

Somewhere in deep space, far away from Cybertron, lies the planet Regalis V. Covered in thick jungles, the planet has no native animal life- but it is instead inhabited by many species of ambulatory plants; something that the Maximals found interesting enough to study.

Beast Machines cartoon
Botanica's ship landed there, and she and her crew took the forms of its native plants to blend in, avoid the attention of the carnivorous (herbivorous?) ones, and study them, similar to Optimus Primal's team on Earth.

The AllSpark Almanac
Regalis V was part of the Nebulon Republic.