Bodhi Druma (Sk.). The Bo or Bodhi tree; the tree of “knowledge the Pippala or ficus religiosa in botany. It is the tree under which Sâkymuni meditated for seven years and then reached Buddhaship. It was originally 400 feet high, it is claimed; but when Hiouen-Tsang saw it, about the year 640 of our era, it was only 50 feet high. Its cuttings have been carried all over the Buddhist world and are planted in front of almost every Vihâra or temple of fame in China, Siam, Ceylon, and Tibet.
Source: H.P.Blavatsky - The Theosophical Glossary