Referring Clues

• 40- and 51-Across, e.g.
• Nursery items
• Kilmer poem that appeared in the August 1913 issue of "Poetry"
• Plain lack
• Arbor Day honorees
• Walnuts and others
• Corners
• Apples and oranges
• Feller's targets
• Park features
• These may be clear-cut
• Squirrels' homes
• They're for the birds
• Arborist's concern
• Ashes, e.g.
• Some surgery patients
• Dendrologists' study
• Cashew and citron
• Skiing hazards
• Shoe stiffeners
• Classic Kilmer poem
• Panda hangouts
• Hammock supports
• Birch and larch
• Apple and orange
• Shady sorts?
• Golf course obstacles
• Nursery sights
• Familial diagrams
• They have certain rings to them
• Grove constituents
• Llano's lack
• Grove components
• Kilmer classic
• Street liners
• Elders with roots
• Alders and elders
• Forest Service concern
• Joyce Kilmer poem
• Black Forest sights
• Balsas and balsams
• Ash and oak
• Giant sequoias, e.g.
• Balsams and balsas
• Some probability diagrams
• "A nest of robins in her hair" poem
• Forest makeup
• They're often clear-cut
• Poem with the line "Poems are made by fools like me"
• Kite trappers
• They're found in nurseries
• Elder and alder, e.g.
• Duffer's obstacles
• Cherries, e.g.
• Shape keepers in a closet
• Street prettifiers
• Ancestry tables
• "Poems are made by fools like me" source
• Apples and oranges, maybe
• Palms, e.g.
• Shade providers
• Alder and elder
• "A nest of robins in her hair" poem
• Kilmer poem
• Shoe accessories
• Sources of shade
• Birches and beeches
• Cedars and sycamores
• Elms or elders
• Genealogy charts
• Classic Joyce Kilmer poem
• Linden and litchi
• Paper source
• Copse composition
• Arboretum specimens
• Black Forest residents
• Apple and orange, for two
• What pampas don't have
• Shoe holders
• Desert's lack
• Forest denizens
• Branch headquarters
• Sequoias, e.g.
• Birch and pine
• Forest features
• Oak and teak
• Grove contents
• Ancestral diagrams
• Poem with the line "Who intimately lives with rain"
• Figure out
• Oxygen emitters
• Windbreak, often
• Famous work of 27-Down
• They're scarce on llanos
• Hammock holders
• Pines and palms
• Kilmer's classic
• Family diagrams
• Targets of Paul Bunyan's ax
• Apple and cherry, e.g.
• Forest Plant
• Grove makeup
• Something for x and y axes
• Shady street liners
• Elflock
• Balsa and balsam
• Joyce Kilmer classic
• Oak and elm, e.g.
• "Poems are made by fools like me" poem
• Joyce Kilmer poem and this puzzle's theme
• Elm and oak
• Arboretum sights
• Fir and spruce
• Source of oxygen
• Forest sights
• Grove view
• Shoe inserts
• Grove sight
• Arbor sights
• Forest flora
• Tundra's lack
• Beeches and birches
• Different ones are hidden in 12 starred answers
• Apple and orange, e.g.
• Much paper, originally
• Pear and apple, e.g.
• Arbor components
• Elm and eucalyptus
• Lemon and lime
• Maple and pine
• There are six hidden in this puzzle in appropriate places
• They may be clear-cut
• Classic poem that begins "I think that I shall never see"
• Almonds and pistachios
• "A nest of robins in her hair" source
• Oranges and lemons
• Fruit growers
• Orchard, essentially
• Orange growers
• Genealogy drawings
• Corners, in a way
• Oxygen producers
• Arboretum flora
• Popular spot for kids' houses
• Elders, e.g.
• Forest units
• Growers in groves
• Classic six-couplet poem
• Copse components
• Dendrologists' concerns
• Feller's targets?
• Forest growths
• Cherry and chestnut
• Birch and palm
• Almond and walnut, e.g.
• Oaks and elms
• Bumbo and ombu
• Golf hazards
• Pears and plums
• Arboretum collection
• Arbor array
• Joyce Kilmer poem that starts "I think that I shall never see"
• They're in every forest
• Pines, e.g.
• Spots for ornaments
• Sturdy plants
• Orchard rows
• This puzzle's obvious theme
• They can sway in the breeze
• Woods components
• Copse makeup
• Ancestry.com diagrams
• Pines
• Pines, say
• Filbert and hazelnut
• Oaks and maples
• Kilmer opus
• Arboretum items
• Poplars, e.g.
• Leaves' homes
• Genealogy diagrams
• Sources of timber
• Orange and lemon, e.g.
• Pecan and walnut
• Large shrubs
• Orchard members
• Willows, e.g.
• What Mark Lanegen climbs?
• Lovehammers song that grew roots?
• "Animal" Neon ___
• Screaming ___
• "Nearly Lost You" band Screaming ___
• "We Can Try" Between the ___
• Rush song that grew roots?
• Ashes, perhaps?
• New Wave band that never grew roots?
• Timber suppliers
• Plants are reportedly in flower
• Small numbers from Dublin? They fit the brogue!
• Park sights
• Kilmer poem containing the line “Poems are made by fools like me”
• Nesting sites
• Apples and oranges?
• Poem with "fools like me"
• For whom the Lorax speaks
• Woods woods
• Forest plants
• Obstacles to avoid while skiing
• What fills a forest
• Forest fixtures
• Formers of natural canopies
• Lumber producers
• Paper sources
• Grove units
• 27 Down citing "leafy arms"
• On which money doesn't grow
• Grove group
• Ashes not caused by fire
• Parts of a forest
• Forest requirement
• They stand in stands
• They're 27-Across, on prairies
• Woody structures
• Ring bearers
• Pecans and pistachios
• Maples, e.g.
• Ring bearers?
• Arbor Day plantings
• Forest components
• According to the poet's oldest son, it was written "by a window looking down a wooded hill"
• They're planted on Arbor Day
• Elders and alders
• Arboretum growths
• Orchard growths
• Beech and birch
• Squirrels climb them
• Beeches and banyans
• Arborist's specialties
• Tundra's lack, usually
• Maples and myrtles
• Beech and peach
• Its penultimate line is "Poems are made by fools like me"
• Plants with rings
• Sequoias and such
• Their bark is silent
• Anchors for a hammock
• Pines and firs
• Orchard plantings
• Sequoias and redwoods
• Parts of a sacred grove
• Makeup of some canopies
• Things that parks and families have
• Some genealogical work
• Forest's makeup
• Palms and pines
• Canopy makeup
• See 4-Down
• Orchard units
• Canopy makers
• Can't see the forest for the ___
• Arborist's charges
• Firs and spruces
• Subjects of the 2019 Pulitzer-winning novel "The Overstory"
• Grove growths
• Arboretum assortment
• Growers in a grove
• Arborist's concerns