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Flatspine Bur Ragweed (Ambrosia acanthicarpa Hook.)

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Range - Expand

Native or Not Present
Introduced or Not Present
Native or Expanded

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 plant is not usually cultivated; it has spread eastward into some new areas. We marked a few of these populations introduced because they are separated from the native range by large distances, but they could easily be marked expanded as well.