Plant Intelligence
See the article on Plant Intelligence in the Annals of Botany: http://aob.oxfordjournals.org/cgi/content/full/92/1/1
Plants communicate with each other over long distances:
http://www.edwardwillett.com/Columns/plantcommunication.htm
http://www.personal.psu.edu/faculty/u/j/ujq/jack.htm#wind
We now have deduced communication between plants at the level of being alarm mechanism. There is no reason to exclude the possibility of higher-level intelligent communication using similar mechanisms.
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