A Route of Evanescence
With a revolving Wheel--
A Resonance of Emerald--
A Rush of Cochineal--
And every Blossom on the Bush
Adjusts its tumbled Head--
Rather than saying “a blur of green”, Dickinson zooms in on the details, though hummingbirds fly so fast. To use  Resonance  and  Emerald  gives the scene a rather royal feeling.
A Route of Evanescence