Possesses low phosphotyrosine phosphatase activity in vitro. Hydrolyzes O-methylfluorescein phosphate in vitro. Dephosphorylates the phosphoinositides PI(3,5)P2. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Highly expressed in flowers. Expressed at low levels in roots, leaves, stems and siliques. Belongs to the protein-tyrosine phosphatase family.