FAMILY WHISPERING. “Populations of sagebrush are genetically structured so that an individual is likely to be surrounded by other individuals that are close relatives. Here, we have demonstrated that plants communicate more effectively with kin and that this communication increases plant resistance to herbivores. Plants responded more effectively to the cues emitted by kin rather than strangers.”
http://rspb.royalsocietypublishing.org/content/280/1756/20123062.short