Latin name:  Anthemis cotula

Family:  Asteraceae

Common name:  Mayweed chamomile, dog fennel

Life cycle:  annual, spreading by seed
Habit:  upright, 12 to 18 inches tall and wide
Foliage:  Foliage is feather-like, deeply dissected, and slightly pubescent.  Hairs are somewhat long though sparse, but are easy to see with a hand lens.
Flowers:  Each flower head is composed of 12 to 15 white ray flowers (they look like white petals) and numerous small yellow disk flowers.
Seedlings:  Cotyledons are rounded to oval, while first true leaves have the typical foliage shape that is deeply dissected.              

Look alikes: Pineapple weed (Matricaria matricarioides) and wild carrot (Daucus carota)  When not in flower, this weed and pineapple weed look very similar.  Pineapple weed does not have hairs on foliage or stems.  Using a hand lens, one can easily distinguish between mayweed and pineapple weed by seeing whether or not there are hairs present on the stems.

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