Related Clues:

• Alder or aspen
• Yule purchase
• Place for a knot
• Squirrel's find
• Branching diagram
• Ash, e.g.
• Christmas symbol
• Squirrel's hangout
• Madrone or magnolia
• Genealogical diagram
• Oak or pine
• It has bark but no bite
• It may be tough to crack
• Hierarchical chart
• Squirrels' hangout