Richard Stoneman writes in his wonderful 'The Greek Experience of India: from Alexander to the Indo-Greeks':
"... It may be possible to add to the list of trees
observed by the Greeks the two that occur in the Latin Letter of Alexander to
Aristotle about India. After his conquest of India,
Some of the wise men of the kingdom came to Alexander and
said, ‘Your majesty, we have something to show you which deserves your special
attention. We will take you to the trees that speak with a human voice’. So
they brought Alexander to a place where there was a sanctuary of the Sun and
the Moon. There was a guardpost here, and two trees closely resembling
cypresses. Around these stood trees that resembled what in Egypt is called the
myrrh-nut [this is the myrobalan tree, or amala, ambla, amlaki in Hindi], and
their fruits were also similar. The two trees in the middle of the garden
spoke, the one with a man’s voice, the other with a woman’s. The name of the
male one was Sun, and of the female one Moon, or in their own language,
Moutheamatous....
...Of the many sacred trees in India, two stand out for
importance, the pipal and the neem. The pipal is perhaps the holiest tree in
India, further sanctified by its association with the Buddha, who achieved
enlightenment sitting under one at Bodhgaya, known as the bodhi tree. It is
regarded as a masculine tree. The neem is widely regarded as a beneficent and
friendly tree, and is usually thought of as a feminine. Many trees in fact have
a feminine aspect, being the home of a yakṣī or (feminine) tree spirit. (Yakṣas,
masculine, are equally common.)
Haberman reports a conversation with two Hindu workers who
were in charge of sweeping the temple at Bodhgaya:
For us there are two sacred trees. One is a god [devata];
the other is a goddess [devi]. The first is the pipal; the second is the neem.
The pipal is Vasudeva; the neem tree is Shervahani.
A pipal and a neem tree entwined (‘married’), near the Rock inscription of Aśoka at East of Kailash, Delhi
Sometimes the trees even intertwine, or are said to be
‘married’, and in the eleventh-century Persian poem Shahnameh the trees
visited by Alexander are said to twine together into a single tree, one trunk
being male and the other female.
…The Alexander Romance makes explicit not only that the
trees are male and female but that they are trees of the Sun and Moon
respectively. The pipal is sometimes said to be ‘the abode of the Sun on earth’
and is associated with the sacred fire: in kindling the sacrificial fire ‘the
friction drill was made from pipal wood and was considered male, whereas the
friction pan was made from sami wood and considered female’. The pipal tree is
also often said to be the home of the god Shani, son of the Sun and brother of
Death, though sometimes he only takes up his abode there on Saturdays, as
otherwise the tree is Vasudev’s....