Dalton Kane and the Greens - The Adventures of Dalton Kane, #1

When humanity first settled Molorthia Six, they thought it was uninhabited. Apparently the treelike Greens were holding still and hiding their fangs. These days, humans live in the Molorthian desert, far from the bloodthirsty forests. Life is going rather miserably for widowed Sheriff Dalton Kane, so it's no real surprise when unexplained forest fires send refugee Greens fleeing toward town. When a violent Green attack leaves several citizens dead, Dalton and his new deputy, an ex-conman named Chumley Fanshaw, make the treacherous journey north to see if they can stop the fires that keep sending Greens in their direction.
They soon find themselves fighting not only for their lives, but for the lives of every human on Molorthia Six. Will Dalton's oldest enemy become his greatest ally?