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Oriental Lady's Thumb (Persicaria longiseta )

Also known as low smartweed; also classified as Polygonum cespitosum.

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Oriental Lady's Thumb
Photo © , CC BY-SA 4.0.


An annual native to east Asia, widely introduced in North America where it is common in suburban gardens and disturbed urban habitats, and occasional in more intact wild ecosystems.

Range - Expand

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.

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Photo © , CC BY-SA 4.0.
Photo © , CC BY-SA 4.0.