Plants › knotweed family

Asian lady's thumb

Persicaria posumbu

Learn Asian lady's thumb free How it works

Wildlife study photograph from iNaturalist. — (c) into_the_out_there, some rights reserved (CC BY-NC)

All photos28

28 photos

Study shows up to four per card, from different observers, so you learn the species rather than one picture. Heart the good ones and swap any you do not like.

See all photos Add a photo

Photos you add are credited to you, and you keep the copyright.

Easily confused with

Study checks a spoken answer against these, and tells you which one you named.

Where it is recorded

Records by month in China.

United States	633
China	353
Taiwan	338
Taiwan Province	337
Pennsylvania	185
West Virginia	120
New Taipei	102
Maryland	101
Virginia	85
New York	77

Counts show where people looked, not only where it lives.

Traits

Group and habits

Medicinal useListed as having medicinal use by a harvested source. This is not medical advice.Kew World Checklist of Useful Plant Species

Edibility, toxicity and medicinal traits are records from datasets, not advice. Never eat, handle or use a wild species on the strength of an app.

Classification

Kingdom	Plants · Plantae
Phylum	Vascular Plants · Tracheophyta
Class	Dicots · Magnoliopsida
Order	pinks, cactuses, and allies · Caryophyllales
Family	knotweed family · Polygonaceae
Genus	knotweeds, smartweeds, and waterpeppers · Persicaria

Study it in a deck

Or build your own from the species near you.

Sources

Names, taxonomy and observation counts: www.inaturalist.org
Photos and recordings: the creator and source are on each one.
Traits: Kew World Checklist of Useful Plant Species (CC BY 4.0)
How much to rely on each source

Remember the name next time.

Practise Asian lady's thumb with real photos from different observers. Say the name out loud, and it comes back just before you would forget it.

Create a free account How it works