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The aspen tree (Populus tremuloides) forms large stands of genetically identical trees (technically, stems) connected by a single underground root system. These trees form through root sprouts coming off an original parent tree, though the root system may not remain a single unit in all specimens. The largest known fully connected aspen is a grove in Utah nicknamed Pando, and some experts call it the largest organism in the world,[1] by mass or volume.[2] It covers 0.43 km2 (106 acres) and is estimated to weigh 6,000 metric tons (6,600 short tons).
http://en.wikipedia.org/wiki/Largest_organisms
