| Kingdom: | Plantae |
| Phylum: | Spermatophyta |
| Class: | Angiospermae |
| Subclass: | Dicotyledoneae |
| Superorder: | Caryophyllidae |
| Order: | Polygonales |
- Family
- Genus
- species – Common Name
- Eriogonum
- (various) – Wild Buckwheat, Desert Trumpet
- Fagopyrum
- sagittatum – Buckwheat
- tataricum – Tartary Buckwheat, Rye Buckwheat
- Oxyria
- digyna – Alpine Sorrel, Mountain Sorrel
- Polygonum
- aviculare – Knot-grass, Goose-grass, Bindweed, Hog-weed
- bistorta – Adderwort, Bistort, Sweet Dock
- hydropiper – Smartweed, Water Pepper, Biting Knotweed
- Rheum
- palmatum – Rhubarb
- rhaponticum – Rhubarb
- Rumex
- acetosa – Sheep Sorrel, Wood Sorrel, Sour Dock
- aquaticus – Water Dock
- crispus – Curly Dock, Narrow-leaved Dock, Garden Patience
- etosa – Garden Sorrel
Polygonaceae
