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Brasica nigra, also known as black mustard, is an annual plant grown for its seeds, which is commonly used as a spice. It is native to the tropics of North Africa and temperate regions of Europe and parts of Asia.  
- "Brassica nigra (L.) K.Koch — The Plant List". http://www.theplantlist.org/tpl1.1/record/kew-2682421.
- "This super bloom is pretty dangerous: Invasive mustard is fuel for the next fire" (in en-US). 2019-04-25. https://www.latimes.com/local/lanow/la-me-ln-mustard-fire-santa-monica-mountains-20190425-story.html.