Hi Dimi, I think this would be a good book to check:
Figs, Dates, Laurel, and Myrrh: Plants of the Bible and the Quran (Hardcover)
By Lytton John Musselman
Timber Press, 2007
The entries are written by a botanist and are substantial. I may have this in my school's library, I'll check further.
PS -- here is an older book, also useful
Zohary, Michael. Plants of the Bible . Cambridge: University Press, 1982
PPS - (things keep occurring to me..)
The Encyclopedia Judaica (multi-volume work) is usually a font of info. A good academic library will have this. I can check on all of these for you.