Flatspine Bur Ragweed (Ambrosia acanthicarpa Hook.)

↑Range - Expand

Legend	Color
Native
Introduced
Expanded
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.

Although this plant occurs somewhere in each of these regions, it may only occur in a small part of some or all of them.

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.