In the article, the study of the morphology, crystal structure and chemical composition of In_xGa_1-xN nanostructures is presented. Scanning electron microscopy measurements show that the sample has a structure consisting of nanotubes, on top of which an array of nanocrystals (so-called "nanoflowers") is formed. The results of transmission electron microscopy show that the nanotubes have a wurtzite crystal structure, whereas the "nanoflowers" exhibit both wurtzite and zinc blende one. The indium composition in wurtzite and zinc blende segments is about 20 % and 10 %, respectively.