Jasminum sambac
The three Sampaguita ("Jasminum sambac") flowers on the lower portion of the shield represents the three republics claimed in Bulacan - Kakarong (1896), Biak-na-Bato (1897), and the Philippine Republic(1898). The lower portion of the shield is red, the same as the shade of red of the flag of the Philippines, which symbolizes patriotism and valor.