I spoke with Christine last night and she alerted me to the possibility that my “Improved Meyer” lemon tree might not be a dwarf tree. After doing research and reading up on the Meyer tree on Widipedia, I found out that Four Winds Growers played a signicant part in the creation of this variety. I called up the nursery and was guided to the answer by identifying the graft. There were no elbow shaped grafts located on the plant, so thus we deduced this was a dwarf tree. Whew!
Karen at Four Winds Growers pointed me to the following link for more information on their history.