| → of a flower receiving its own pollen, 1859 1860 1861 1866 1869 |
| receiving pollen from the same flower, 1872 |
|
| → C. C. Sprengel has 1859 1860 1861 1866 1869 |
| Sprengel, and more recently Hildebrand, and others, have 1872 |
|
| → plants 1859 1860 1861 1866 1869 |
| so-named dichogamous plants 1872 |
|
| ↑ 1 blocks not present in 1859 1860 1861; present in 1866 1869 1872 |
| So it is with the reciprocally dimorphic and trimorphic plants previously alluded to.
|
|
| → in so many cases be 1859 1860 1861 1866 1869 |
| be in so many cases 1872 |
|
| → as I have found, 1859 1860 1861 1866 1869 |
| OMIT 1872 |
|
| → mongrels: 1859 1860 1861 1866 1869 |
| as I have found, mongrels: 1872 |
|
| → I suspect that it 1859 1860 1861 1866 1869 |
| It 1872 |
|
|
no special mechanical contrivance to prevent the stigma
→of a flower receiving its own pollen,
yet, as
→C. C. Sprengel has
shown, and as I can confirm, either the anthers burst before the stigma is ready for fertilisation, or the stigma is ready before the pollen of that flower is ready, so that these
→plants
have in fact separated sexes, and must habitually be crossed. ↑
How strange are these facts! How strange that the pollen and stigmatic surface of the same flower, though placed so close together, as if for the very purpose of self-fertilisation, should
→in so many cases be
mutually useless to each
How simply are these facts explained on the view of an occasional cross with a distinct individual being advantageous or indispensable! |
|
| If several varieties of the cabbage, radish, onion, and of some other plants, be allowed to seed near each other, a large
→as I have found,
of the seedlings thus raised
turn
→mongrels:
for instance, I raised 233 seedling cabbages from some plants of different varieties growing near each other, and of these only 78 were true to their kind, and some even of these were not perfectly true. Yet the pistil of each cabbage-flower is surrounded not only by its own six stamens, but by those of the many other flowers on the same
How, then, comes it that such a vast number of the seedlings are mongrelized?
→I suspect that it
must arise from the pollen of a distinct
variety
having a prepotent effect over
own pollen; and that this is part of the general law of good being derived from the intercrossing of distinct individuals of the same species. When distinct
species
are crossed the case is
for a
own pollen is
prepotent over foreign pollen; but to this subject we shall return in a future chapter. |
|
| In the case of a
tree covered with
|
