Torreya Volume 21-23

Torreya Volume 21-23

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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. 1921 edition. Excerpt: ... "two or three flowers next to the dark central one are so characterized." He believed that the latter did not make the umbel more conspicuous to insects, and while other investigators believed this flower to be neuter or sterile, he obtained seeds from it by fertilization. A micro-dissection made indicates that the seeds obtained from the purple flower are probably fertile, although the conclusive test would be germination. Darwin did not consider the dark central flower to be of any importance, but considered it instead to represent a former condition of the species where the central flower alone was female. Its position was held to be the consequence of the fact that when irregular flowers become regular or peloric, they are apt to be central, and such peloric flowers owe their origin to arrested development or reversion. He additionally comments that in other species the larger central blossom may be correlated with the fact that it may be better nourished than the others, and may produce larger or different seeds. Of interest in connection would be some knowledge of the distribution of the purple central flower in the cultivated variety of the carrot, which botanists state to be derived from the wild form discussed. However, there is no record in standard works of horticulture as to the relative abundance of the purple flower in the cultivated variety, and seed growers state that to their best knowledge, (but without extended observation), the cultivated carrot has the same percentage of purple florets as the wild one, although they have rarely seen more than one purple floret to the umbel. L. H. Bailey writes that in a good number of specimens of the cultivated carrot, there is no trace of a purple flower. This, however, ...show more

Product details

  • Paperback | 114 pages
  • 189 x 246 x 6mm | 218g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236778251
  • 9781236778253