. Flower ecology. Plant ecology; Fertilization of plants. 19 len grains is such that it is easily carried by the wind. It consists of three cells, one of which only is fertile. The others serve to buoy the pollen and therefore make it of easy transport. The pistillate flowers are colored red, and have a large receptive surface. Pollen of conifers has been carried for more than a hun- dred miles. The so-called "showers of sulphur" on ponds consist of pollen grains which were suspended in the air and brought down during a shower of rain. Alder '^^^ alder, which is a common plant in Eas
. Flower ecology. Plant ecology; Fertilization of plants. 19 len grains is such that it is easily carried by the wind. It consists of three cells, one of which only is fertile. The others serve to buoy the pollen and therefore make it of easy transport. The pistillate flowers are colored red, and have a large receptive surface. Pollen of conifers has been carried for more than a hun- dred miles. The so-called "showers of sulphur" on ponds consist of pollen grains which were suspended in the air and brought down during a shower of rain. Alder '^^^ alder, which is a common plant in Eastern States and Northeastern Iowa, bears its stamine flowers in long festoons. The pistillate catkins are more or less Fig. 10. ner von Marilaun.) FIG. 10. 1-2 Bhodiidendrnn hirsutum, i Bpilobium angustifoHum. (After Ker- Usually self-pollination is not prevented in the cultivated European species, nor in some of our wild species. John H. Lovell states the Alnus incana is partially dioecious. Honey bees occasionally visit the stamine flowers for Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Pammel, Louis Herman, 1862-1931. [n. p. ] Press of J. B. Hungerford
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectfertili, bookyear1898
