The author is Alan Birkett and this is an eBook available as a download to the Books app of iMacs, Apple Laptops, iPads and iPhones from the Apple Books Store at £4.49.
Use this link to find the book on Apple Books
It is also available from Amazon Kindle books as a download to the Kindle Fire and other Android and Apple devices at £4.60, using the Kindle app.
Use this link to find the book on Amazon
The book describes 42 families that between them contain many of the garden and wild flowers found in Britain. There are over 700 photographs covering 424 flowering plant species, 253 of which are found in gardens and 171 in the wild. In each family, the book illustrates similarities and differences between wild and garden flowers.
It explains why flowers take the forms they do and uses close-up photographs to illustrate pollination and fruit formation. The book describes how species have evolved within families.