Answer:

aspens

Answer	Crossword Clue
ASPENS	Their limbs may shake
ASPENS	Populus members
ASPENS	Rocky Mountain trees

ASPENS	Colorado trees
ASPENS	Quakers in the woods
ASPENS	Poplar trees
ASPENS	Trembling trees
ASPENS	Quaking trees
ASPENS	Quivering trees
ASPENS	Soft-wooded trees
ASPENS	Fluttering trees

ASPENS	Quakers in the forest?
ASPENS	Quakers with deep roots?
ASPENS	Arboreal quakers
ASPENS	Trees with trembling leaves
ASPENS	Trees in the Rockies
ASPENS	Trees that tremble in the breeze
ASPENS	Quakers in the forest
ASPENS	Quakers in the woods?

ASPENS	"Quaking" trees
ASPENS	Rocky Mountain quakers
ASPENS	Poplars
ASPENS	"Ouaking" trees
ASPENS	They're used to make matches
ASPENS	Poplar cousins
ASPENS	Fluttery poplars
ASPENS	Poplars with fluttering leaves

ASPENS	Poplars.
ASPENS	Trees.
ASPENS	Tremblers.
ASPENS	Trees that tremble.
ASPENS	Trees with tremulous leaves.
ASPENS	Tremulous trees.
ASPENS	Quaking trees.
ASPENS	Trees with quivering leaves.

ASPENS	Colorful trees.
ASPENS	Trembly trees
ASPENS	Shaking trees
ASPENS	Poplar varieties
ASPENS	Resort and tree