The umbellifers provide us with many foods and garnishings – the roots of carrots and parsnips, the 'stalks' of angelica and celery, the leaves of parsley and fennel and the seeds of coriander, caraway, etc. On the other hand, some species, such as Hemlock, Conium maculatum, are very poisonous. All the water-dropworts, Oenanthe, are toxic to man and livestock to some extent, but it is Hemlock Water-dropwort, O. crocata, that is by far the most dangerous.