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.
Allen, Grant: The Colour of Flowers.
Aveblry, Lord: Flowers, Fruits, and Leaves.
Beale, W. J.: Birds.
Behrens, W. J.: Blumen u. Insekten.
Darwin, C: Cross- and Self-pollination.
Darwin, C: Fertilization of Orchids.
Darwin, C.: Forms of Flowers.
Guppy, H. B.: Studies on Fruits and Seeds.
Henslow, G.: The Making of Flowers.
Hildebrand, F.: Die Farben der Bliiten.
Kerner von Marilaun, A., and Oliver, F. W.: The Natural History of Plants.
Kerner von Marilaun, A.: Flowers and their Unbidden Guests.
Knuth, P.: Flower Pollination.
Muller, H.: Fertilization of Flowers (full Bibliography).
Riley, C. V.: Monograph on Yucca Pollination.
Sprengel, C. K.: Entdecktes Geheimnis der Natur.
Trelease, W.: Fertilization of Flowers by Humming Birds.
Wallace, Sir A. R.: Darwinism.
 
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