This section is from the book "British Wild Flowers - In Their Natural Haunts Vol5-6", by A. R. Horwood. Also available from Amazon: A British Wild Flowers In Their Natural Haunts.
Druce, G. C: Hayward's Botanist's Pocket-book.
Fox, H.: How to find and name Wild Flowers.
Hooker, Sir W. J.: British Flora.
Hooker, Sir W. J., and Arnott, G. A.: British Flora.
Knapp, F. H.: The Botanical Chart.
Lindley, J.: Synopsis of the British Flora.
Smith, Sir J. E.: English Botany.
Smith, Sir J. E.: The English Flora.
Smith, Sir J. E.: Compendium of the English Flora.
Steele, W. E.: A Handbook of Field Botany.
Watts, W. M.: A School Flora.
Withering: Arrangement of British Plants. (See also under Floras, XIII.)