MMMM HMMMM the apical meristem would be the center of the rosette down inside the bulb like-rhizome. An easy way to think of it is like a banana tree, where the apical meristem is not at the top under the newest proto leaf, but rather and the bottom of the pseudostem (the "trunk" of a banana tree")
They'd be found on the bottom the the leaf lamina, so under it. I don't know if they would be found under the petiole. I never thought of it. It makes sense.