The Collaborative International Dictionary of English v.0.48:

Banyan \Ban"yan\ (b[a^]n"yan or b[a^]n*y[a^]n"), n. [See
   Banian.] (Bot.)
   A tree of the same genus as the common fig, and called the
   Indian fig (Ficus Indica), whose branches send shoots to
   the ground, which take root and become additional trunks,
   until it may be the tree covers some acres of ground and is
   able to shelter thousands of men.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bo tree \Bo" tree`\ (Bot.)
   The peepul tree; esp., the very ancient tree standing at
   Anurajahpoora in Ceylon, grown from a slip of the tree under
   which Gautama is said to have received the heavenly light and
   so to have become Buddha.
   [1913 Webster]

         The sacred bo tree of the Buddhists (Ficus
         religiosa), which is planted close to every temple,
         and attracts almost as much veneration as the status of
         the god himself. . . . It differs from the banyan
         (Ficus Indica) by sending down no roots from its
         branches.                                --Tennent.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ficus \Fi"cus\, n. [L., a fig.]
   A genus of trees or shrubs, one species of which (F.
   Carica) produces the figs of commerce; the fig tree.
   [1913 Webster]

   Note: Ficus Indica is the banyan tree; F. religiosa, the
         peepul tree; F. elastica, the India-rubber tree.
         [1913 Webster]