Here is Ulhas ji's reply against other mail:
"3) Kalpataru is an abstract name used for very very useful plants,
wherein all the parts of plant are useful. In the Konkan region
Coconut palm is called Kalpataru because of its multiple use in that
region. Baobab (Adonsonia digitata) is an ecological kalpataru since
the tree supports diverse ecosystems. The same could be said for the
trees from Ficus group - Banyan, Pimpal, Umbar etc. These trees are
called Keystone species due to their ecological importance.
I have found Sandal (Santalum album) tree very useful. Its economic
properties are well known, however its ecological value is immense.
It is evergreen, hardy, fast growing and supports different form of
animal life. I won't mind calling it Kalpataru."