ambrosia psilostachya 21 Associations

western ragweed perennial ragweed Ambrosia psilostachya ragweed (generic term) ambrosia (generic term) bitterweed (generic term)

perennial ragweed 17 Associations

western ragweed Ambrosia psilostachya ragweed (generic term) ambrosia (generic term) bitterweed (generic term)

western ragweed 15 Associations

perennial ragweed Ambrosia psilostachya ragweed (generic term) ambrosia (generic term) bitterweed (generic term)