[Wikipedia] Europe, North Africa, and the Middle East native: Mentha pulegium, commonly (European) pennyroyal, or pennyrile, also called mosquito plant[1] and pudding grass,[2] is a species of flowering plant in the mint family, Lamiaceae, native to Europe, North Africa, and the Middle East (contributed by Mary Ann Machi)

[Wikipedia] Invasiveness: In California, where it is considered an invasive species, it occupies a similar niche, in seeps, streamsides, vernal pools and swales, marshes, and ditches. There is some speculation that it may displace native species in these areas. (contributed by Mary Ann Machi)