Quakers in forests (6)

I believe the answer is:

aspens

(Other definitions for aspens that I've seen before include "Trees that shiver, kind of poplars" , "Kind of poplars with shivering leaves" , "Trembling poplars" , "Quivering poplars" , "Species of poplars with leaves that quiver" .)

I've seen this clue in The Wall Street Journal.

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