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Knotweed indigo

Language: 
Botanical classification

Polygonum tinctorium Aiton

Order: 
Caryophyllales
Family: 
Synonyms: 
Ampelygonum tinctorium (Aiton)Steud.
Persicaria tinctoria (Aiton) H. Gross
Persicaria tinctoria (Aiton) Spach
Pogalis tinctoria (Aiton) Raf.
Used part of the plant: 
Leaf
Use for paper making: 
Dye