Iva annua

Common Name:  Annual Marshelder

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male heads--the genus Iva is closely related to Ambrosia (the ragweeds).  Both are wind-pollinated, unlike most members of the sunflower family.  One major difference between the two genera, however, is that in Iva the bracts subtending each male head are large and conspicuous. leaves--what is the leaf arrangement?
leaf--what types of leaf margin and leaf venation are present?