This inconspicuous yellow flower is in the Mustard Family (Brassicaceae), with its flower parts in fours. Growing alongside a road, I figured it had a good chance to be nonnative, and sure enough, it's been introduced from Europe. The common name is desert madwort, desert alyssum, or dwarf alyssum (
Alyssum desertorum).
I found virtually no additional information about desert madwort on the internet, but I did come across
this handy guide from Montana identifying some of the more common Mustard Family members. If you click back to the home page, you can see that this website is an excellent guide for flowers of the western U.S.
This inconspicuous yellow flower is in the Mustard Family (Brassicaceae), with its flower parts in fours. Growing alongside a road, I figured it had a good chance to be nonnative, and sure enough, it's been introduced from Europe. The common name is desert madwort, desert alyssum, or dwarf alyssum (Alyssum desertorum). 
I found virtually no additional information about desert madwort on the internet, but I did come across this handy guide from Montana identifying some of the more common Mustard Family members. If you click back to the home page, you can see that this website is an excellent guide for flowers of the western U.S.
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