blackweed

== English == === Noun === blackweed (uncountable) Common ragweed (Ambrosia artemisiifolia.) ==== Synonyms ==== annual ragweed, low ragweed === References === blackweed on Wikipedia.Wikipedia Ambrosia artemisiifolia on Wikispecies.Wikispecies Category:Ambrosia artemisiifolia on Wikimedia Commons.Wikimedia Commons