Biology 130
Ambrosia artemisiifolia;
common ragweed [Asteraceae]
Native annual herb with finely dissected
leaves. Grows 12-40” topped
with inflorescences of many, small, bead-like heads on 6” spikes.
Copious, wind-blown, pollen is a principal cause of hay fever.
A ubiquitous weed of disturbed sites throughout the state.
Flowers in late summer and fall.
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