https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/2628858Edit ImageSaveSaveEditCropCustom TextPrairie Thistle (Cirsium undulatum) (1923) by Mary Vaux Walcott. Original from The Smithsonian. Digitally enhanced by rawpixel.MorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGTIFFLarge 2184 x 3120 px | 300 dpiBest Quality 2184 x 3120 px | 300 dpi | 39.03 MBFree DownloadPrairie Thistle (Cirsium undulatum) (1923) by Mary Vaux Walcott. Original from The Smithsonian. Digitally enhanced by rawpixel.More