Stem-clasping polygonum from Edwards’s Botanical Register (1829—1847) by Sydenham Edwards, John Lindley, and… https://www.rawpixel.com/image/559257/knotweed-plant-posterFree Image from public domain licenseRed polygonum flower png vintage botanical illustration https://www.rawpixel.com/image/2609333/free-illustration-png-vintage-flower-botanical-fresh-knotgrassView licenseVintage stem-clasping polygonum flower branch for decoration https://www.rawpixel.com/image/559009/knotweed-plantView licenseVintage leaf botanical illustration vector, remix from Weltall und Menschheit book https://www.rawpixel.com/image/2778846/premium-illustration-vector-art-artwork-botanicalView licenseVintage stem-clasping polygonum flower branch for decoration https://www.rawpixel.com/image/559388/knotweed-plantView licenseTwo species of knotweed (Polygonum species): flowering stems. Coloured lithograph by W. G. Smith, c. 1863, after himself. https://www.rawpixel.com/image/13969270/image-flower-plant-grassFree Image from public domain licenseSix British wild flowers, including water pepper and knotweed (Polygonum species). Coloured lithograph, c. 1846, after H.… https://www.rawpixel.com/image/13961025/image-flower-plant-grassFree Image from public domain licenseVintage leaf botanical illustration png, remix from Weltall und Menschheit book https://www.rawpixel.com/image/2768624/free-illustration-png-vintage-japanese-knotweed-japaneseView licenseDuizendknoop (Persicaria) (1596 - 1610) by Anselmus Boëtius de Boodt and Elias Verhulst https://www.rawpixel.com/image/13743236/image-paper-flower-plantFree Image from public domain licenseA plant, possibly a knotweed (Polygonum species): flowering stem and leaves. Watercolour. https://www.rawpixel.com/image/13961957/image-rose-flower-plantFree Image from public domain licenseVintage leaf botanical illustration psd, remix from Weltall und Menschheit book https://www.rawpixel.com/image/2768625/premium-illustration-psd-japanese-knotweed-art-artworkView licenseVintage leaf botanical illustration, remix from Weltall und Menschheit book https://www.rawpixel.com/image/2771391/premium-illustration-image-japanese-knotweed-art-artworkView licenseTwo plants, one possibly a knotweed (Polygonum species). Watercolour. https://www.rawpixel.com/image/14014689/two-plants-one-possibly-knotweed-polygonum-species-watercolourFree Image from public domain license