A flowering butterwort plant (Pinguicula vulgaris) and two pinnae (fins). Coloured engraving by J. Pass, c. 1824. https://www.rawpixel.com/image/13969450/image-butterfly-flower-plantFree Image from public domain licenseCalifornia Butterwort (Pinguicula macroceras). Original public domain image from Flickr https://www.rawpixel.com/image/3309815/free-photo-image-acanthaceae-animal-annonaceaeFree Image from public domain license