Oenanthe crocata aka Hemlock Water Dropwort

Oenanthe crocata, also known as hemlock water-dropwort or dead man's fingers, is a highly toxic flowering plant in the carrot family. Native to Europe, North Africa, and western Asia, it thrives in damp grasslands and wet woodlands, often found along river and stream banks. This perennial plant has elongated root tubers and erect, hollow, grooved stems. Its pinnate leaves accompany white umbels of flowerheads, which bloom from July to August. Caution should be around this plant, as all its parts are extremely toxic and can cause poisoning in humans and livestock. Interestingly, Oenanthe crocata has been linked to the production of the infamous "sardonic grin" and is also considered a possible candidate for the "sardonic herb" mentioned in ancient histories.