Possible Clues:

• Plant parasite mostly found around the root of ragwort
• Mythical plant inducing languor
• Bloomer associated by Koestler with automaton
• Place fortune on American sports car
• Place for parking by American plant
• One of the lilies, classy among a whole bunch
• We forget having eaten this large amount, you and me
• Fruit of forgetfulness - water lily - car marque
• In Greek mythology, a fruit which induces forgetfulness
• Plant in department of France no good for anything