. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. PLANTAGINACEAE 323. easily shaken by the wind. These flowers seem to be exclusively anemophilous, for Delpino never saw them visited by insects. (2) Plants with shorter scapes, which also seem to be almost exclusively anemophilous, for Delpino only once saw a Halictus collecting pollen on the inflorescences. (3) A dwarf mountain form, with short spikes and stamens. Delpino observed numerous bees collecting pollen, while the Halictus mentioned above could onl
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. PLANTAGINACEAE 323. easily shaken by the wind. These flowers seem to be exclusively anemophilous, for Delpino never saw them visited by insects. (2) Plants with shorter scapes, which also seem to be almost exclusively anemophilous, for Delpino only once saw a Halictus collecting pollen on the inflorescences. (3) A dwarf mountain form, with short spikes and stamens. Delpino observed numerous bees collecting pollen, while the Halictus mentioned above could only collect a small amount, most of it falling to the ground. Delpino concluded from this last observation that the structure of the flowers is unsuited for pollen-collecting bees. Hermann Miiller rightly observes, however, that Delpino has possibly taken for granted certain adaptations in the third form (on which he saw the honey- bee collecting pollen) which are not actually present, simply because of the abundant pollen collected by the honey- bee. This, however, results from this bee's habit of smearing the pollen with nectar. Gynomonoeciously or gynodioeci- ously distributed female flowers occur now and then in addition to the hermaphrodite ones. Schulz says that they are usually 20-25 %; ^.nd some- times even 50 %. The flowers of purely female stocks have either yellow anthers with reduced pollen, or no anthers at all. They are more fertile than the hermaphrodite flowers, and only appear (according to Ludwig) towards the end of the flowering season. Different zones of flowers can be recognized on the spikes of gynomonoecious stocks, one bearing purely female flowers, another hermaphrodite ones, and the third of intermediate character with occasional reduced stamens. Visitors.—Hermann Miiller in Westphalia, and myself in Schleswig-Holstein, saw the honey-bee as a pollinator. Hermann Miiller gives the following account (with which my own observations agree) of the way in wh
Size: 1482px × 1686px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisheroxfor, bookyear1906
