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Annual Marsh Elder (Iva annua L.)

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Range - Expand

Native or Not Present
Native or Expanded
Expanded or Not Present

This tentative map is based on our own research. It may have limited data on Canada and/or Mexico, and there is some subjectivity in our assignment of plants as introduced vs. expanded. Read more in this blog post.

This weedy species has spread eastward, taking advantage of agriculture and other human land alterations, sometimes also growing in roadside ditches. We mark all new populations expanded, even if somewhat isolated, because it is spreading largely on its own, and has spread pretty consistently at the boundaries of its range.