Related Clues:

• Ash, e.g.
• Christmas symbol
• Squirrel's hangout
• Madrone or magnolia
• Genealogical diagram
• Oak or pine
• It has bark but no bite
• Frond-bearing plant
• Nonflowering plant
• Hierarchical chart
• Squirrels' hangout
• Swing support, perhaps
• It's stuffed with wood
• Woods plant
• Cherry or chestnut