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The Origin of Floral Structures Through Insects and Other Agencies

The Origin of Floral Structures Through Insects and Other Agencies


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888. Excerpt: ... that the and types are exceedingly common in the foliage" of Monocotyledons, while the f, as far as I am aware, is entirely wanting in that class, whether in foliage or flowers. Of genera having alternate leaves but associated with a binary or quaternary floral symmetry, there are about 270 in number of about 30 orders. Now, the co-existence of alternate leaves with 2-or 4-merous flowers appears at first sight to negative the theory; but, as mentioned above, these and other irregularities have been brought about by subsequent differentiations in the foliage or flowers. On the other hand, opposite leaves with quaternary flowers are not at all infrequent, though not quite so common as when they are alternate; thus, Oleacece and Onagracec e are so conditioned. Again, in liosacece, which is an order characterized by having alternate leaves and 5-merous flowers, three genera alone out of seventy have opposite leaves, and these three also are accompanied by 4-merous flowers; viz. Rhodotypus, Coleogyne, and Eucryphia. These three genera thus acquire their importance from being isolated amongst others to which they are allied, and which are generally otherwise characterized. Many orders have both foliage and floral symmetry remarkably inconstant, and all four combinations, viz. 4merous and 5-merous flowers with opposite or alternate leaves almost indiscriminately, as in the tribes Diosmece and Borosmece of Rutaceo; and it is a noticeable fact that, associated with this inconstancy of correlation, there is an inconstancy in the leaf arrangement, opposite and alternate leaves being often in species of the same genus, and even on the same individual plant. The total number of genera noticed as having 4-merous flowers and opposite leaves was 110 in 25 orders; where...


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Product Details
  • ISBN-13: 9781150939068
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 106
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1150939060
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 204 gr

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