Sequencing of flowering in wild bird seed or shank 'foxtail' ( Phalaris minor). Spikelets (name of the floral structures in grasses) are opening on the top to the bottom of the ear in just 1 or 2 days. © E. Laguna, 06.03.2011
Most Allergy to pollen from plants are caused by wind-pollinated plants, ie they are confident that the wind is the main pollinator, rather than primarily on insects or other forms to facilitate fertilization. As we have said in previous messages, many plants thrive precisely such late winter or early spring, which enables them to attract passing alternative to insects for pollination also help, although much of it is made mostly by wind. Consequently some of the plants that cause allergic reactions much bloom at precisely this time, which includes species such as cypress or some groups of grasses, even if this extended family of flowering plants for a much longer period, unlike that of the cypress trees. The sequence of rainfall with short stages of drought and frosts alternating with rapid temperature increases between late 2010 and early March 2011 has encouraged a flowering earlier than expected for many species of wild plants (radish, marigolds, wild oats, etc.). will not prevent in many cases the same species bloom lasts through times where he usually did, or what is, not all of the floral period later in block, but it really gets longer, except that a prolonged detention of the rains forced to halt its explosion of flowers. The result is that allergic individuals can spend one year in 2011 worse than usual. Hopefully this does not become a usual pattern for the coming years.
Detail of a section of flowering stem Phalaris minor, which shows the anthers with the 'libraries' (pollen sacs) are already open. Small yellow spots on the top of the photo are just grains of pollen. © E. Laguna, 06.03.201 1
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