Meyer lemon tree
Unusual hard freeze appeared to kill lemon tree. However, shoots are growing from base of tree. Will a Meyer lemon tree grow or will the root stock produce a different tree?
You are correct, it is likely growing from the root stock. There is not way to know the citrus variety of root stock; it is likely a rough lemon or a sweet orange.
It's tough losing a plant, let alone a lovely Meyer Lemon Tree.