Various species of Earth flora
Amerind was an inhabited planet half a galaxy away from Earth, which was nonetheless discovered in the 23rd century to contain settlements of pre-warp Humans. Various species of Earth flora were also transplanted on the planet. Examples of this flora included pine trees, honeysuckles, and orange blossoms. (TOS: "The Paradise Syndrome")
Some centuries before 2268, several threatened tribes including a mixture of Navajo, Mohican, and Delaware Indians, were transplanted from Earth to Amerind by a group known to them as the Wise Ones. The Wise Ones also transported flora from Earth to mirror the environment that the Indians had lived in. The Wise Ones placed an obelisk on the planet that possessed an asteroid deflector, used to protect the planet's inhabitants.
By the mid-23rd century the obelisk had malfunctioned, leaving the planet vulnerable to asteroid collisions.
In 2268, the USS Enterprise was on a mission to divert an asteroid, nearly the size of Luna, off the collision course it was on with Amerind. Although the Enterprise was unable to stop it, they were able to repair the deflector in the obelisk, which was in turn able to deflect the asteroid and once again protect the planet. (TOS: "The Paradise Syndrome")
Background information Edit
The name Amerind, a portmanteau of the planet's inhabitants, appeared in the episode's script and was not mentioned on screen. The scenes taking place on Amerind were filmed at the Hollywood Reservoir near Mulholland Drive.
For the 2007 remastered edition of "The Paradise Syndrome", the planet Amerind received a new look, replacing the original version with a computer-generated planetscape.
The exact date of the transplantation was not established in the episode. However, an examination of real-world history shows the mentioned Navajo, Mohican and Delaware tribes all in danger of becoming extinct around the late 18th century.