Crossword Genius

Rockies trees (6)

Ross

I believe the answer is:

aspens

(Other definitions for aspens that I've seen before include "The leaves of the trees flutter in the slightest breeze" , "Poplar trees that shiver in the wind" , "Species of poplars with leaves that quiver" , "Quivering poplars" , "Trembling trees" .)

I've seen this clue in The Washington Post.
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