this branch of plants is one i have always avoided and have since about 1979, i took some survial nature classes many years ago, and the instructor was very adament about avoiding the poison hemlock since it is so deadly so i have always just avoided it since there are so many other good no lethal plants out there.
here is a link to wikipedia about these plants but i would say just avoid them
http://en.wikipedia.org/wiki/Conium

• plant ID - Keven aka joe the lion 14:48:46 07/03/2008 (3)
  • second picture - Keven still 14:50:30 07/03/2008
    • this is a tough on dude - woofer 22:16:23 08/24/2008
      • woofer - Uncle Bill 22:35:31 08/24/2008