. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. NECTAR OF FLOWERS 95 are only perceived by these special visitors, or are at any rate peculiarly sympathetic to them. For example— Andrena florea F. is found exclusively in Bryonia dioica/ac^. (vide supra); Andrena Hattorfiana F. and Cetii exclusively on Knautia arvensis Coult.; Andrena Nasuta Gir. exclusively on Anchusa officinalis L.; Bombus Gerstaeckeri Mor. exclusively on Aconitum Lycoctonum Z.; Cilissa melanura Nyl. almost exclusively on Lythrum Salicar
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. NECTAR OF FLOWERS 95 are only perceived by these special visitors, or are at any rate peculiarly sympathetic to them. For example— Andrena florea F. is found exclusively in Bryonia dioica/ac^. (vide supra); Andrena Hattorfiana F. and Cetii exclusively on Knautia arvensis Coult.; Andrena Nasuta Gir. exclusively on Anchusa officinalis L.; Bombus Gerstaeckeri Mor. exclusively on Aconitum Lycoctonum Z.; Cilissa melanura Nyl. almost exclusively on Lythrum Salicaria L.; Macropis labiata Pz. almost exclusively on Lysimachia vulgaris L.; Osmia adunca Latr. and Caementaria Gersi. almost exclusively on Echium. On the other hand, bees of the genus Prosopis, which themselves possess a strong odour, prefer to seek out flowers that have a powerful smell, due to their containing ethereal oils— Ruta, Anethum, Reseda, Lepidium, Achillea, Matricaria. Many flowers are almost entirely scentless during the day, and exhale a very strong odour in the evening and at night. These are, without exception, moth flowers (see p. 67). Flowers offer Pollen, and usually also Nectar or enclosed Sap, as food to the insects that have been enticed by colour or odour; and in return for this the visitors, as a rule, effect transference of pollen, cross-pollination being thus brought about in many cases. Sometimes flowers also afford insects Shelter, which they can leave again at pleasure, or else they are compelled to make an unwilling stay of considerable duration. Pollen alone, as a reward for work done, is offered by relatively few flowers to the insects that visit them and thereby effect pollination. These Pollen Flowers will be considered more fully later on (cf. p. 105). Secretion of Nectar usually takes place deep down in the flower by means. Please note that these images are extracted from scanned page images that may have been digitally enhanced for re
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