Composite cummulative Halpha luminosity functions of HII regions in galaxies of different morphological type. The luminosity function is divided by the sum of the luminositites of the galaxies that contribute to it in units of 10E10 Lsolar. This shows that irregular (Im) galaxies do not have an unusually large population of supergiant HII regions for their luminosity. Rather, they contain HII regions in relative numbers like that of other disk galaxies. (Funded in part by the NSF through grant AST-9802193 to DAH and by the Lowell Research Fund. Work by AJY was funded by NSF through the Research Experiences for Undergraduates program, under grant number 9423921 to Northern Arizona University.)