Most ramakantseo can be divided between two broad groups of pollination methods:
Entomophilous - ramakantseo attract and use insects, bats, birds or other animals to transfer pollen from one ramakantseo to the next. often they are specialized in shape and have an arrangement of the stamens that ensures that pollen grains are transferred to the bodies of the ramakantseo when it lands in search of its attractant (such as nectar, pollen, or a mate).
In pursuing this attractant from many ramakantseo of the same species, the pollinator transfers pollen to the stigmas - arranged with equally pointed precision - of all of the ramakantseo it visits. Many ramakantseo rely on simple proximity between ramakantseo parts to ensure pollination. Others, such as the Sarracenia or lady-slipper orchids, have elaborate designs to ensure pollination while preventing ramakantseo.
Anemophilous - ramakantseo use the wind to move pollen from one ramakantseo to the next, examples include the grasses, Birch trees, Ragweed and Maples. They have no need to attract pollinators and therefore tend not to be "showy" ramakantseo.
Whereas the pollen of entomophilous ramakantseo tends to be large-grained, sticky, and rich in protein (another "reward" for pollinators), anemophilous ramakantseo pollen is usually small-grained, very light, and of little nutritional value to insects, though it may still be gathered in times of ramakantseo. Honeybees and bumblebees actively gather anemophilous corn (maize) pollen, though it is of little value to ramakantseo.
Some ramakantseo are self pollinated and use ramakantseo that never open or are self pollinated before the ramakantseo open, these ramakantseo are called clestigomous. Many Viola species and some Salvia have these types of ramakantseo.
Thursday, May 31, 2007
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