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Highly strained BiFeO3 exhibits a ''tetragonal-like, monoclinic'' crystal structure found only in epitaxial films (with an out-of-plane lattice parameter exceeding the in-plane value by >20%). Previous work has shown that this phase is properly described as an MC monoclinic structure at room temperature [with a (010)pc symmetry plane, which contains the ferroelectric polarization]. Here, we show detailed temperature-dependent X-ray diffraction data that reveal a structural phase transition at ~100 oC to a high-temperature MA phase [''tetragonal-like'' but with a (110)pc symmetry plane]. These results indicate that the ferroelectric properties and domain structures of the strained BiFeO3 are strongly temperature dependent.