Ram's Horn (Proboscidea louisianica (Mill.) Thell.)

↑Range - Expand

Legend	Color
Native
Expanded
Native or Not Present
Native or Expanded
Expanded or Not Present
Native or 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 species is widely planted, but has weedy tendencies, spreading through its seed sticking to animal fur. It has escaped cultivation continent-wide. Although it consists mostly of scattered, isolated populations, on a larger scale it has established so consistently across the continent, in many different ecoregions, that we chose to mark it as expanded everywhere. It is likely that it will continue to expand. The exact extent of the native range is not known; we used BONAP's distinction between Native and Adventive as a starting point.