Which of The Guardians of the Galaxy is a tree-like creature ? 
Guardians of the Galaxy (2008 team):  Dan Abnett and Andy Lanning formed the team from existing and previously unrelated characters created by a variety of writers and artists, with an initial roster of Star-Lord, Rocket Raccoon, Quasar, Adam Warlock, Gamora, Drax the Destroyer and Groot. Groot:  An extraterrestrial, sentient tree-like creature, the original Groot first appeared as an invader that intended to capture humans for experimentation.
Groot