https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13970649Edit ImageSaveSaveEditCropCustom TextPrairie burdock (Silphium terebirthinaceum): sections of the flowering stem with separate flower and fruit. Coloured engraving after F. von Scheidl, 1770.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 724 x 1200 px | 300 dpiLarge JPEG 2112 x 3500 px | 300 dpiBest Quality JPEG 2126 x 3523 px | 300 dpiFree DownloadPrairie burdock (Silphium terebirthinaceum): sections of the flowering stem with separate flower and fruit. Coloured engraving after F. von Scheidl, 1770.More