American Pomology, by Dr. J.A. Warder, Part 2
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The Infertility of Flowering Plants
hybrids do not often occur, though in dioysius plants this seems to have been the case with willows. Hybrid may be fertilized by pollen taken from one of its parents and that then the offspring assumes the characters of that parent. In our efforts with the strawberry, some very curious results have occurred,. Some of the recognized species appear under this severe test to be well-founded as the results have been infertile. Certain fruits swell and ripen perfectly, though containing not a single well-developed seed.
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