Rubber Tree People
The Rubber Tree People or Rubber People were an ancient Native American tribe who lived in the rainforests of Central America on Earth. They were among the "Inheritors," descendants of Humans to whom a genetic bonding was imparted by an alien race which the Rubber Tree People referred to as "Sky Spirits."

Some descendants of the Rubber Tree People chose to remain in the jungle and live in the way of their ancestors, never leaving and rarely intermarrying with outsiders. Due to their isolation, by the 24th century they had evolved similar facial features to the Sky Spirits, a result of the genetic modifications which the Spirits had performed on them.

Other descendants included Chakotay's tribe. In 2344, two members of this tribe, Kolopak and his fifteen-year-old son, Chakotay, ventured into the jungle to find descendants who had chosen to isolate themselves, although Chakotay was less than enthusiastic about the journey. Twenty-eight years later, the  discovered the Sky Spirits' homeworld in the Delta Quadrant, and Chakotay, who by this time was Voyagers first officer, learned the story of how the Spirits had visited his ancestors. ()

External link 
The Rubber Tree People: Mayan or Myth? – an analysis of Chakotay's heritage

de:Kautschukbaumvolk
Chakotay's tribe