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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


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.

Description & Identification

Looks similar to other Persicaria species; the most distinctive features are the decumbent (sprawling and only weakly upright) growth habit and the long bristles on the sheaths beneath the inflorescence and also where leaves meet the stems.

Persicaria longiseta (Creeping Smartweed) | Illinois Wildflowers (About This Site)

Persicaria longiseta (Oriental Lady's Thumb) | USDA PLANTS Database (About This Site)

Persicaria longiseta | Go Botany (About This Site)

Persicaria longiseta | Biota of North America Project (BONAP) (About This Site)

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