Purple Threeawn (Aristida purpurea Nutt.)

↑Range - Expand

Legend	Color
Native
Introduced
Present: Various or Uncertain Origin
Native or Not Present
Introduced or Not Present
Native or Introduced
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.

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 species is native and widespread in the west, including the western portions of the Great Plains, but it becomes uncommon and scattered in the eastern Great Plains. It is sometimes used in landscaping, and can escape into the wild; it is also favored by grazing as it is less attractive to livestock than other grasses. It has established in a number of eastern sites; we marked most of these populations Introduced because they are mostly isolated except for a few that were very close to the native range. Where exactly to make the cutoff represents a subjective judgment call, and we may update this map if we receive new information.