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Latin name: Anthemis cotula
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Family: Asteraceae
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Common name: Mayweed chamomile,
dog fennel
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Life cycle: annual, spreading by
seed
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Habit: upright, 12 to 18 inches
tall and wide
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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.
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Flowers: Each flower head is composed
of 12 to 15 white ray flowers (they look like white petals) and numerous
small yellow disk flowers.
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Seedlings: Cotyledons are rounded
to oval, while first true leaves have the typical foliage shape that is
deeply dissected.
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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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