Possible Clues:

• Tree line with curve
• Coniferous tree with deciduous bright green needles
• Polar Christmas tree stocked within
• Tree from civil architect
• Check on tailless bird in tree
• Relative of a cedar
• Shielded by poplar, chestnut tree
• Wood in some yachts
• Large curved structure in wood
• Wood that becomes a St. Louis landmark when you remove its first letter