Ragweed:
Ragweeds are flowering plants in the genus "Ambrosia" in the aster family, Asteraceae.
en.wikipedia.org
豚草屬:
豚草属（學名："Ambrosia"）是一种原产于北美洲的杂草，适应力极强而且生长旺盛的植物，屬於双子叶植物纲的菊目菊科。
zh.wikipedia.org
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Ragweed豚草屬