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| much-branched subshrub with silvery leaves and small white flowers of Texas and northern Mexico; much-branched subshrub with silvery leaves and small white flowers of Texas and northern Mexico; cultivated as a source of rubber ❲Parthenium argentatum❳ | |||
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| tropical American annual weed with small radiate heads of white flowers; tropical American annual weed with small radiate heads of white flowers; adventive in southern United States ❲Parthenium hysterophorus❳ |