Waiter, there’s poison in my soup

"Chef sorry for poison plant error" is the title of a recent piece on the BBC News website. Celebrity (their word, he means nothing to me) chef Antony Worrall Thompson is quoted in a magazine interview about watercress and other wild foods saying that the weed henbane is "great in salads".  According to the BBC: "Healthy & Organic Living magazine's website has now issued an urgent warning that "henbane is a very toxic plant and should never be eaten". The chef had meant to recommend fat hen, which is a wild herb."
Henbane (Hyoscyamus niger) has sticky serrated leaves; yellow, funnel-shaped flowers; and a stale scent. It can cause hallucinations, drowsiness and disorientation in humans.
Larger quantities can cause a loss of consciousness, seizures, trembling of the limbs and, in extreme cases, death. Hawley Harvey Crippen, also known as Dr Crippen, is thought to have used seeds from the henbane plant to kill his wife in 1910. 
Fat hen, on the other hand, is safely edible. Species include Aristolochia rotunda (Smearwort); Atriplex prostrata (Spear-leaved Orache); and Chenopodium album (White Goosefoot). I also learn (from Wikipedia) that the "plump version" of the eagle on the Bundestag is sometimes called "fat hen". Strange world.
Healthy & Organic Living magazine's editor Kate Collyns has written to subscribers to apologise. Her publication's website gives this advice: "As always, check with an expert when foraging or collecting wild plants." Not celebrity chef A. W. Thompson, one assumes. Or Prince Charles, but we knew that already. (See Tomorrow's Table for a good account of why P. C. need not worry, and therefore spout, so much.)