Gordon R. Dickson , Flat Tiger , in Guided Tour, a TOR Book, Tom Doherty Associates, New York. First published 1956 by Galaxy Publishing. Robert L. Forward, Martha Dodson Forward, and Margaret Dodson , Marooned on Eden , Baen Books, 1993. The dominant species is a slow moving tree. Symbiotic birds are flying eyes.
Simian creatures are the hands to bring food to the mouth.
First published 1935. The major race, Centaurians, evolved from plants. They value any animal product above gold. They come to realize the entire planet is one huge being, and the ganglionic structures at the root of every plant are like nerve cells in human brains. The team's antagonistic empath, who had been literally driving the rest of them crazy, is reluctantly left behind when he disappears into the forest to calm the entity and avoid further confinement with the team's emotional effluvium.