Graveolent describes a plant that stinks to high heaven.
Anthemis cotula or Stinking Chamomile, photo by Javier martin
I suppose the word may give some of us a dignified way of declining an extra helping of broccoli...
Thing Not To Be Today: graveolent. This word was made up in the 1600s from the Latin words gravis, heavy, and olēre, to smell, presumably by someone who fancied himself too refined to refer to a good honest stink.