Plants › knotweed family
arrow-leaved tearthumb
Persicaria sagittata
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.
Photos you add are credited to you, and you keep the copyright.
Easily confused with
halberd-leaved tearthumbPersicaria arifolia
low smartweedPersicaria longiseta
pinkweedPersicaria pensylvanica
spotted lady's thumbPersicaria maculosa
Dotted SmartweedPersicaria punctata
China knotweedPersicaria chinensis
mile-a-minute weedPersicaria perfoliata
pale smartweedPersicaria lapathifolia
Study checks a spoken answer against these, and tells you which one you named.
Where it is recorded
| United States | 17,212 |
|---|---|
| Canada | 4,476 |
| Ontario | 2,407 |
| Pennsylvania | 1,431 |
| New York | 1,029 |
| Virginia | 857 |
| Maryland | 831 |
| North Carolina | 822 |
| Michigan | 809 |
| Minnesota | 700 |
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
- Medicinal Plants of Baltimore County
- Plants of Charleston County, South Carolina, United States
- Plants of Richmond city, Virginia, United States
- Trees of Maryland
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 arrow-leaved tearthumb with real photos from different observers. Say the name out loud, and it comes back just before you would forget it.