The Origin of Floral Structures Through Insect and Other Agencies
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The Origin of Floral Structures Through Insect and Other Agencies

The Origin of Floral Structures Through Insect and Other Agencies


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER III. THE PRINCIPLE OF NUMBER?Continued. Illustrations Of Special Numbers.?It will now be advisable to give examples of particular numbers occurring in flowers, and attempt to account for them. One-membered Whorls.?-Where one part to a whorl is only found, it may in nearly every case be regarded as a degradation from some higher number. The only instances I am aware of in which the calyx seems to consist of a single member are some species of Aristolocliia. In Mussccnda one out of the five sepals is greatly enlarged to become an attractive organ. One petal is occasionally found. Thus, four genera of VochysiaceoB have each only one petal to their flowers; but as the sepals are five in each of the seven genera of this order, and the petals range from one to five in number, the inference is clear that the solitary petal of these four genera is due to the arrest of the others. One stamen occurs more frequently; as in Hippuris, Centranthus, Euphorbia, Casuarina, Orchis, Canna, Lilcea, Lemna, etc. As allied genera have more than one, and it is accompanied by other signs of degradation or metamorphosis, If there be one external foliar organ only, it is regarded as a bract, as in Willows and Aponogeton. there is no doubt but that similar processes will account for one stamen as for one petal. Thus Hippuris with one, is allied to Myriopliyllum with four; while Centrantlius has one, Fedia has two and Valeriana three. Casuarina alone seems to raise a doubt of its being degraded and possibly a primitive form; but this is solely because it has no living allies (excepting perhaps Myrica). The terminal stamen would not be of itself a point of importance, as it has a parallel in Euphorbia; but it is its isolation without affinities, its peculiar equisetum-like habi...


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Product Details
  • ISBN-13: 9780217099523
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 118
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 0217099521
  • Publisher Date: 08 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 227 gr

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