Affinities of Plants; With Some Observations Upon Progressive Development

Affinities of Plants; With Some Observations Upon Progressive Development

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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. 1839 edition. Excerpt: ... of the Anonal and Ranal alliances. The orders named in the top line appear then almost exact imitations of those in the bottom one, but though there is a close approach in character there is not a complete union, they are like circles touching each other, but though they touch they do not unite, yet as we find not only the orders in question, Rosacea; and Ranunculaceae, but the allied tribes of each maintaining a similarity, it seems scarcely possible to disconnect them and place them in distant parts of a system since we find in them a circle of affinity, and their existing differences are liable at any time to be set at nought by the discovery of a plant which shall unite the organization of both, exactly as Cistaceae and Papaveraceae have been rather unexpectedly found to be allied by the discovery of Dendromecon. One single species discovered between Calycanthus and lllicium with hypogynous stamens in the order of the former, as is found in Saxifragaceae, or cxalbuminoiis, in that of the latter, as Nelumbiacese is in the Albuminous group, would render the affinity no longer questionable; the transition is almost as easy between Rosacea; aud Ranunculaceae; betweenUmbelliferae and Ranunculaceae it is already sufficiently recognized. But the epigynous character of the Umbellal alliance might be made as serious an objection to the association of that order with the rest of Albuminosae, as of Albuminosae with Rosaceous orders, but for the general resemblance in structure and properties existing between Ranunculaceas and Apiacea?. Till the value of characters therefore shall be more clearly ascertained, it does not appear that we can ground our ideas of affinity on a firmer basis than this general similarity, which in the orders above.mentioned...
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Product details

  • Paperback | 32 pages
  • 189 x 246 x 2mm | 77g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236638522
  • 9781236638526