Missouri constitution
Article IV: executive department
Section 23

The fiscal year of the state and all its agencies shall be the twelve
months beginning on the first day of July in each year. The general assembly shall
make appropriations for one or two fiscal years, and the sixty-third general assembly
shall also make appropriations for the six months ending June 30, 1945. Every
appropriation law shall distinctly specify the amount and purpose of the appropriation
without reference to any other law to fix the amount or purpose.