This plant is widespread but only locally common throughout the UK and Ireland.
The common name comes from the fact that the tuberous root is connected to the main plant by only a relatively thin linking fibre.
Hemlock water-dropwort flowers mainly in June and July. It is a perennial umbelifer and can sometimes reach shoulder height. Because it is such a poisonous plant, the stems should not be used for making peashooters.
The pictures on this page were taken in West Wales in July.