White horehound (Marrubium vulgare) illustration. Digitally enhanced from our own book, Medical Botany (1836) by John…
https://www.rawpixel.com/image/327091/free-illustration-image-jame-morss-churchill-horehound-john-stephenson-whiteFree Image from public domain license
White horehound (Marrubium vulgare) illustration from Medical Botany (1836) by John Stephenson and James Morss Churchill.