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San Diego bur ragweed
55%
Ambrosia chenopodiifolia
western ragweed
40%
Ambrosia psilostachya
common ragweed
38%
Ambrosia artemisiifolia
Tucson bur ragweed
34%
Ambrosia cordifolia
hollyleaf bur ragweed
30%
Ambrosia ilicifolia
flat-spine bur ragweed
30%
Ambrosia acanthicarpa
ambrosia bursage
30%
Ambrosia ambrosioides
dwarf bur ragweed
30%
Ambrosia pumila
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