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Ubiquitous, but this was the first one I saw in flower. Actually smells pretty good.
not sure if this is a tarweed or not...
Holocarpha heermannii. Glad I stopped to take a pic of this ubiquitous aster.
Holocarpha is a small genus of flowering plants in the daisy family. The genus contains four species of tarweeds which are all endemic to California. These are glandular, aromatic annual herbs bearing yellow flowers.