A broadleaf tree of the poplar genus whose flattened leafstalks make its leaves tremble even in a light breeze. It is well known for forming huge clonal groves connected by a shared root system.
In Utah, a forest that looks like many trees is actually one giant aspen clone. Called Pando, its 47,000 stems share one underground root system. It covers 43 hectares and may weigh 6,000 tons, making it a candidate for Earth’s heaviest organism.