the intelligent plant
'' Plants are able to sense and optimally respond to so many environmental variablesÃ¯Â¿Â½Ã¯Â¿Â½"light, water, gravity, temperature, soil structure, nutrients, toxins, microbes, herbivores, chemical signals from other plantsÃ¯Â¿Â½Ã¯Â¿Â½"that there may exist some brainlike information-processing system to integrate the data and coÃÂ¶rdinate a plantÃ¢ÂÂs behavioral response. The authors pointed out that electrical and chemical signalling systems have been identified in plants which are homologous to those found in the nervous systems of animals. They also noted that neurotransmitters such as serotonin, dopamine, and glutamate have been found in plants, though their role remains unclear.''
Here is a link that might be useful: The New Yorker