Can you show us the whole plant (?). With out flowers to help narrow down, I’m wondering if this might be a species in the Matricaria genus. If this is of the genus, checkout these species are listed in AZ, M. chamomilla (scented mayweed), M. discoidea (pineappleweed) from these included links below. If this isn’t a match, make new post with photos of the rest of the plant & flowers when it blooms. Best wishes!
Link to pineappleweed.