. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 44 BOTANY wasted. Therefore in such plants several thousand; perhaps hundreds of thousands of pollen grains will be developed to every ovule produced. Such are the pines. In May and early June the ground under pine trees is often yellow with pollen, and the air may be filled with the dust for miles from the trees. Such, also, is the case with many of the grasses, the pollen being produced in such abundance that it causes a disease called hay fever. (2) The pistil of the flower is peculiarly
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 44 BOTANY wasted. Therefore in such plants several thousand; perhaps hundreds of thousands of pollen grains will be developed to every ovule produced. Such are the pines. In May and early June the ground under pine trees is often yellow with pollen, and the air may be filled with the dust for miles from the trees. Such, also, is the case with many of the grasses, the pollen being produced in such abundance that it causes a disease called hay fever. (2) The pistil of the flower is peculiarly fitted to retain the pollen by having feathery^ projections along the sides which in-. The staminate flower of the corn. Notice the hanging anthers full of pollen. crease the stigmatic surface. This can be seen in the grass. In the Indian corn the stigmatic surface is thfe so-called silk which protrudes beyond the covering of modified leaves which form the husk of the ear of corn. All our grains, wheat, rye, oats, and others, have the typical feathery pistil of the wild grasses from which they 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 Hunter, George William, 1873-1948. New York, American book company
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