Danger of wrong identification of wild carrot family herbs

Whenever you go finding and identifying wild edible herbs, you must be very careful in the proper identification of species from the carrot (Apiaceae) family.

Never collect and eat plants from this family from the wild, since some are very similar between each other and also very poisonous. They can be frightening similar to parsley, chervil, carrots or parsnips. Some even smell carrot-like and have sweet flavours! Nevertheless, small ammounts can cause death by muscle paralysis.
Some examples are:

• Fool's Parsley, Aethusa cynapium
• Hemlock, Conium maculatum
• Water dropwort, Oenanthe crocata
• Water hemlock, Cicuta spp.
  

http://en.wikipedia.org/wiki/List_of_poisonous_plants