Tropical Horseweed (Erigeron sumatrensis Retz.)
Also known as white horseweed, Guernsey fleabane, tall fleabane, broad-leaved fleabane, Sumatran fleabane; also classified as Conyza sumatrensis (Retz.) E.Walker.
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↑Range - Expand
| Legend | Color |
| Introduced | |
| Introduced 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 to southeastern Mexico and may also have expanded its range or been introduced to other parts of Mexico; we have yet to build this portion of its map. For now we mark the US populations as Introductions because we have not yet seen evidence that its new range is connected to its native range, but we may update its classification if we find such evidence.
↑Notes
Of the many common names, we prefer "tropical horseweed" because it communicates the close resemblance to horseweed (Erigeron canadensis), as well as the fact that this species is native to the (American) tropics. The scientific name and corresponding common name "Sumatran fleabane" is unfortunately misleading as this species is not native to Sumatra.
↑Links & External Resources
• Erigeron sumatrensis | Biota of North America Project (BONAP) (About This Site)
• tall fleabane | CABI Invasive Species Compendium (About This Site)
