Photo by Rache Charles; identification by Andrew Sanders, UC Riverside Herbarium
Common on old demolition site, mainly with other exotic weeds.
Riverside County, California, US
Extremely invasive and noxious.
Hirschfeldia incana (formerly Brassica geniculata) is a species of flowering plant in the mustard family known by many common names, including Shortpod mustard, Buchanweed, Hoary mustard and Mediterranean mustard. It is the only species in the monotypic genus Hirschfeldia, which is closely related to Brassica. The species is native to the Mediterranean Basin but it can be found in many parts of the world as an introduced species and often a very abundant noxious weed. This...