Related Clues:

• Apple, to a botanist
• Ash, e.g.
• Christmas symbol
• Squirrel's hangout
• Madrone or magnolia
• Genealogical diagram
• Oak or pine
• It has bark but no bite
• Hierarchical chart
• Squirrels' hangout
• Swing support, perhaps
• It's stuffed with wood
• Cherry or chestnut
• Family diagram
• Shoe stretcher