Answer:

elms

Answer	Crossword Clue
ELMS	"Desire Under the .."
ELMS	Hardwood sources
ELMS	Shade trees

ELMS	Shade trees for O'Neill
ELMS	"Desire Under the ..." (1936 O'Neill play)
ELMS	Shady street liners
ELMS	Shady trees
ELMS	Some are slippery
ELMS	"Desire Under the ....."
ELMS	Street liners
ELMS	Avenue liners

ELMS	Desirous milieu?
ELMS	.Desire Under the ....
ELMS	New Haven flora
ELMS	Stately shaders
ELMS	The Liberty Tree, et al.
ELMS	Vanishing shade-givers
ELMS	"Desire Under the ..."
ELMS	"The moan of doves in immemorial ...": Tennyson

ELMS	Tennyson's "immemorial" trees
ELMS	Samara-bearing trees
ELMS	Furniture-wood sources
ELMS	Boston's Liberty Tree and others
ELMS	"Slippery" trees
ELMS	Big shaders
ELMS	O'Neill title ender
ELMS	Shade makers

ELMS	Shady group
ELMS	Spreading trees
ELMS	Shade providers
ELMS	Backyard spreaders
ELMS	Slippery things?
ELMS	Colonnade lineup
ELMS	Shady arbor, perhaps
ELMS	Tall trees

ELMS	Big spreaders
ELMS	Pennsylvania Avenue liners
ELMS	Stately shade trees
ELMS	Trees in an O'Neill title
ELMS	Colonnade choices