Update: A Facebook follower posted the link to the Pando wiki page. It’s quite impressive and I highly recommend checking it out, but here’s a little excerpt:
Pando (Latin for “I spread”, also known as The Trembling Giant) is a clonal colony of a single male Quaking Aspen (Populus tremuloides) located in the U.S. state of Utah, all determined to be part of a single living organism by identical genetic markers and one massive underground root system. The plant is estimated to weigh collectively 6,000,000 kg (6,600 short tons), making it the heaviest known organism. The root system of Pando is estimated to be among the oldest known living organisms in existence at 80,000 years of age.