Verbena Canadensis (rose mock vervain) enlarged 10 times from Urformen der Kunst (1928) by Karl Blossfeldt. Original from… https://www.rawpixel.com/image/2224147/karl-blossfeldt-macrophotographyFree Image from public domain licenseFive British wild flowers, including broomrape (Orobanche caerulea), vervain (Verbena officinalis) and toothwort (Lathraea… https://www.rawpixel.com/image/13966766/image-flower-plant-grassFree Image from public domain licenseVervain (Verbena officinalis): flowering stem and floral segments. Coloured engraving after J. Sowerby, 1800. https://www.rawpixel.com/image/14021448/image-flower-plant-grassFree Image from public domain license