KIN VOLATILES. “A growing number of plants have been found to respond to volatile cues released when neighbours are damaged by herbivores to prime or increase their defences to future risk of attack. Sagebrush (Artemisia tridentata) responded most effectively when volatile cues were emitted by genetically identical clones compared with strangers, suggesting the ability to distinguish self from non-self and to respond more strongly to ‘self’ signals.”
http://rspb.royalsocietypublishing.org/content/280/1756/20123062.short