[Cal-IPC] Invasive: Agrostis avenacea (Pacific bentgrass) is a perennial grass (family Pocaceae) commonly found throughout northern California and San Diego County. This weed easily outcompetes native vegetation. Pacific bentgrass inhabits open, disturbed, often moist places to 300 m elevation. It is especially invasive in vernal pool habitat in the San Diego area. (link added by Mary Ann Machi)

[Wikipedia] Australia, New Zealand, and other Pacific Islands native, invasi: Lachnagrostis filiformis (syn. Agrostis avenacea) is a species of grass known by the common names Pacific bent grass, New Zealand wind grass, fairy grass, or blown-grass. It is native to Australia, New Zealand, and other Pacific Islands including New Guinea and Easter Island. While it is found in a wide variety of habitats, it seems particularly invasive in areas with damp soils, such as areas near bodies of water. It has been introduced to southern Africa, the United Kingdom, Taiwan, the southern United States and Mexico. In Australia it is a fire hazard, and interferes with trains. Lachnagrostis filiformis is known elsewhere as an introduced species and sometimes a noxious weed. It is particularly invasive in California, where it is a weed of sensitive vernal pool ecosystems around San Diego. (link added by Mary Ann Machi)