Flora colossus

Flora colossus is a species of plant-like organisms native to the planet X. The most noteworthy individual from this species is Groot, a member of the Guardians of the Galaxy.

History
One of the Flora colossus, Groot, became involved with the criminal Rocket, becoming a friend to him as well as Rocket's partner in crime. Groot fought in the Battle of Xandar and became a member of the Guardians of the Galaxy.

Characteristic Traits
The Flora colossus are humanoid in stature with a thick, robust body structure that makes them almost invulnerable to physical harm. Other abilities include a highly-accelerated healing factor, and the ability to extend portions of their body.

Trivia

 * In the comics, the Flora colossus was the first extraterrestrial race to be introduced in the Marvel Universe.