Related Clues:

• Sturdy one
• Acorn, eventually
• Shade provider
• Ilex, for one
• Hard wood
• See 14-Across
• Symbol of strength
• House shader
• Source of 85-Down
• Kind of tree
• Furniture material
• Iowa's state tree
• 'Red' or 'white' tree
• Yellow-ribboned tree
• Squirrel's home