Rhododendron rhododendron
Incl. Azalea, Hymenanthes, Ledum; Ledum palustre => Rhododendron tomentosum.
Dichotomous table for leafminers
1a lower-surface blotch mine, in fact a little contracted tentiform mine; older larvae live free in a folded leaf: Caloptilia azaleella
1b gallery-blotch mine on Rh. tomentosum: Lyometia ledi
1c gallery mine on Rh. tomentosum: Stigmella lediella
1d fleck mine on Rh. tomentosum: Coleophora ledi
1e galls, etc. => Tables for all parasites per species