“EXPERT USE of secure chemical signals, similar to chemical signaling by intelligent microorganisms, permits plants to perpetrate social altruism and cheating. Such phenomena can be found for the most evolved plants—the prominent monocot crop plants (maize, rice, wheat, barley) which entered co-evolution with humans—and orchids which evolved deceptive behaviors to attract pollinating animals to minimize ecological tradeoffs.”
http://journal.frontiersin.org/article/10.3389/fcimb.2013.00044/full