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An Introduction to the Study of Botany

An Introduction to the Study of Botany


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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 edition. Excerpt: ...and presents a number of fine hairs, named collectively the pappus. The corolla is just like the ligulate corolla of a ray floret, except that the five teeth are all plainly shown. The andrcecium and gyncecium are as those of the Daisy or the Groundsel. We can now pass to the method of fertilization of these plants. All of them are entomophilous. The grouping of so many florets into capitula gives, as Sir John Lubbock points out in his " British Wild Flowers in Relation to Insects," three advantages: (1) conspicuousness; (2) attractiveness, as honey is easily obtained from so many flowers without change of place (3) better chance of fertilization, as not one, but many, florets are touched by the visiting insect. To these may be added (4) better chance of cross-fertilization. The florets of each capitulum open centripetally--i.e. from without inwards--and they are protandrous. An insect generally visits them centripetally; i.e. crawls from the circumference of the head towards the centre. If the stamens of the outer florets are ripe, pollen carried from them to the inner florets will not fertilize them, as their stigmas are not yet ready. But the visit of an insect to another capitulum whose outer floret stigmas, we assume, are ripe, means their fertilization. Further, it is evident from this centripetal order of development and of visit, that the production of pollen by the outer florets is of less importance than its production by the inner florets. In connexion with this fact is the absence of the andrcecium in so many ray florets, and the consequent enlargement of the corolla. The ray florets play the part then of rendering the plant conspicuous. In Centaurea they are often destitute even of gynoecia, are neuter or barren....


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Product Details
  • ISBN-13: 9781234268084
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 58
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1234268086
  • Publisher Date: 16 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 122 gr


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