The complete sequence of Potato virus M from Solanum muricatum was determined. The liner, single-strand and positive sense genomic RNA was 8526 nucleotides long and six open reading frames were identified. The genome organization was typical feature of genus Carlavirus. Sequence analysis showed that PVM isolates shared 62.5% - 97.2% nucleotide and 60.9% - 97.4% amino acid identities. The coat protein gene was most conserved and TGB3 gene was greatly variable. Phylogenetic tree analysis suggested that the Idaho potato isolate (PVM-Id) was a distant strain, and other 4 isolates were grouped discriminatively based on CP and NABP amino acid sequences respectively. This is the first report of PVM from Solanum muricatum.