Piaranthus geminatus (Masson) N.E. Br.: milkweed (1777–1786) painting in high resolution by Robert Jacob Gordon.… https://www.rawpixel.com/image/3089329/free-illustration-image-antique-art-animalFree Image from public domain licenseHand drawn pink flowers. Original from Biodiversity Heritage Library. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/2880496/free-illustration-image-milkweed-tropical-caribbeanFree Image from public domain licenseZijdeplant (Asclepias syriaca) (1596 - 1610) by Anselmus Boëtius de Boodt and Elias Verhulst https://www.rawpixel.com/image/13742750/image-paper-flower-plantFree Image from public domain licenseDuvalia caespitosa (Masson) Haw (Milkweed) (1777 - 1786) by Robert Jacob Gordon https://www.rawpixel.com/image/13738801/duvalia-caespitosa-masson-haw-milkweed-1777-1786-robert-jacob-gordonFree Image from public domain licenseDifferent types of butterfly illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own 1892… https://www.rawpixel.com/image/324285/free-illustration-image-butterfly-animals-insectsFree Image from public domain licenseDifferent types of insects illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own 1892… https://www.rawpixel.com/image/324343/free-illustration-image-vintage-insect-animal-orbignyFree Image from public domain licenseFour figures showing pericarp and seeds in fruits of an apple and a milkweed plant (Asclepias syriaca). Coloured etching by… https://www.rawpixel.com/image/14007793/image-plant-art-leafFree Image from public domain licenseA plant (Vincetoxicum officinale Moench.): flowering plant with roots and separate fruit and seed. Coloured etching by M.… https://www.rawpixel.com/image/13980161/image-flower-plant-grassFree Image from public domain license