法苑珠林 7.24

7.24

復何因緣名拘牟陀地獄。此諸眾生地獄之中。猛火焰色如拘牟陀華。是故名為拘牟陀地獄。

Furthermore, for what cause and reason is it called the Kumuda hell? In the hell of these sentient beings, the colour of the fierce flames is like the kumuda flower. Therefore, it is called the Kumuda hell.