Horticultural Society

Horticultural Society

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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. 1850 edition. Excerpt: ...fertility of the pollen of another species. There are, however, two exceptions to this law: --1. In fertile hybrids, where neither the pollen of the male nor female parent is effective, fecundation is produced by the pollen of some pure, nearly allied species: as in Nicotiana rusticopaniculata, on which the pollen of neither N. rustica nor N. paniculata has any effect, impregnation is readily produced by N. Langsdorfii. Mr. Thwaites has found a compound embryo in the genus Fuchsia. Two forms were grafted together, one possessing the character of F.fulgens, the other of F. coccinea. It is clear, however, from his account, that they did not arise from a union of pure species. The seedlings were too varied to allow of such a supposition. See Ann. of Nat. Hist., 2nd series, vol. i. p. 163. 2. Again, it occasionally happens that where a plant cannot be fertilized with its own pollen, that of another individual of the same species, or even of some nearly allied species. is efficient. Lobelia fulgens, for instance, though impregnable to its own pollen, yields fruit with that of L. cardinalis and L. syphilitica, while the potency of the former pollen is proved by its impregnating either of the latter species. Mr. Herbert found similarly that Zephyranthes carinata, though inactive to its own pollen, was fecundated by that of Z. tubispatha. The effect of strange pollen on the female organs of the matrix may be regarded in four points of view--as causing disorganization, as imparting vital energy, as procreative, and as giving form. 1. The first action of the p'ollen is a certain degree of disorganization of the stigma, and then of the blossom. This is the consequence of every efficient impregnation. Imperfect impregnation has also the same effect, but at a..show more

Product details

  • Paperback | 126 pages
  • 189 x 246 x 7mm | 240g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236502841
  • 9781236502841