I suggest this is not a book to buy on trust. Look at it in a library or bookshop before deciding. The antique style of the author becomes increasingly exasperating. There are 500 pages, and it could all have been done better in 300.
Here is a random sample paragraph complete from page 294:
'As it was, a third youthful enthusiast for this same line of work, Charles Babington (Fig.129), fortunately had very different ideas on how best to fertilise it with money, when in his late teens the death of his father left him with financial freedom of action similarly. In his case, that change happened to coincide with a scarcely less traumatic territorial severance. Having poured his adolescent energies into compiling a Flora of the district round Bath (which he was now able to afford to put into print), the arrival of his university years dictated a wrenching disengagement from that. Cambridge, however, provided a double substitute anchorage: another countryside to help assuage that Flora-compiling hunger; and after graduation and becoming a resident semi-don, a base from which to extend his floristic curiosity to the British Isles as a whole.'
Look at Fig 16, John Ray, as an example of how illustrations have been cut and the original proportions disregarded. Clearly the author knows his subject and has a mass of material to present, but the book is out of balance, far too scissors-&-paste, and to me lacks the energy and delight usually found in the superb New Naturalist series.