(8/5. 'Botanische Zeitung'
1868 page 626.) He fertilised twenty-nine flowers on one of them with
their own pollen, and they did not set a single capsule. Thirty flowers
were then fertilised with pollen from a distinct plant, one of the three
growing together, and they yielded only two capsules. Lastly, five
flowers were fertilised with pollen from a fourth plant growing at a
distance, and all five produced capsules. It seems therefore probable,
as Fritz Muller suggests, that the three plants growing near together
were seedlings from the same parent, and that from being closely related
they had little power of fertilising one another. (8/6. Some remarkable
cases are given in my 'Variation under Domestication' chapter 17 2nd
edition volume 2 page 121, of hybrids of Gladiolus and Cistus, any one
of which could be fertilised by pollen from any other, but not by its
own pollen.)
Lastly, the fact of the intercrossed plants in Table 7/A not exceeding
in height the self-fertilised plants in a greater and greater degree in
the later generations, is probably the result of their having become
more and more closely inter-related.
UNIFORM COLOUR OF THE FLOWERS ON PLANTS, SELF-FERTILISED AND GROWN UNDER
SIMILAR CONDITIONS FOR SEVERAL GENERATIONS.
At the commencement of my experiments, the parent-plants of Mimulus
luteus, Ipomoea purpurea, Dianthus caryophyllus, and Petunia violacea,
raised from purchased seeds, varied greatly in the colour of their
flowers.
Pages:
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445