The mystical Mother Tree that once watched over the island has disappeared, and the Harvest Goddess is nowhere to (metacritic.com)
In fact, every Hass Avocado in the world can trace its lineage to the original Hass Mother Tree. (californiaavocado.com)
Dow used genetic analysis to trace the parentage of 282 individual acorns collected from three mother trees in a single stand of bur oak (Quercus macrocarpa) on an abandoned farm in northern Illinois. (newscientist.com)