Fig
Grapefruit tree
Hemlock (sorry I cheated)
Integral
Juniper
Kauri Pine
No.1: The Larch. The…Larch.
Maple
The** N**ational Christmas Tree
Orange Tree
Pine
Quince tree
Redwood
Sequoia
Teak
Umbrella Palm
Violet tree
Weeping Willow
X must mark the spot of a tree which begins with that letter, because I couldn’t find one.
Yew
(Yeah, yew!)