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Matricaria discoidea
commonly known as pineappleweed, wild chamomile, and disc mayweed is an annual plant native to North America and Northeast Asia but which has become a cosmopolitan weed. It is in the family Asteraceae. The flowers exude a chamomile/pineapple aroma when crushed. They are edible and have been used in salads (although they may become bitter by the time the plant blooms) and to make herbal tea. Pineapple weed has been used for medicinal purposes, including for relief of gastrointestinal upset, infected sores, fevers, and postpartum anemia.
Thank you very much for ID C. Daehler. As I added from Wikipedia, they are edible and have been used in salads and to make herbal tea. Pineapple weed has been used for medicinal purposes! I have been spotting so many toxic ones, so I am very happy to know that this plant is useful.