Large centaury, Centaurea scabiosa (1596–1610) by Anselmus Boëtius de Boodt. Original from the Rijksmuseum.… https://www.rawpixel.com/image/561400/centaury-flower-vintage-styleFree Image from public domain licenseEuropean centaury, Erythraa centaurium illustration. Digitally enhanced from our own book, Medical Botany (1836) by John… https://www.rawpixel.com/image/327128/free-illustration-image-flower-centaury-erythraeaFree Image from public domain license