Species that he discovered and that were named after him include the Caucasian black grouse (Tetrao mlokosiewiczi) and the golden peony (Paeonia mlokosewitschii).
The species he identified, which are also known by his name, consist of the Caucasian black grouse (Tetrao mlokosiewiczi) and the golden peony (Paeonia mlokosewitschii).