But in case of
failure to intercross these blossoms that are dependent upon
insect help to set fertile seed, what then? Must the plant run
the risk of extinction? Self-fertilization may be an evil, but
failure to produce seed at all is surely the greatest one. To
guard against such a calamity, insignificant looking flowers that
have no petals to open for the enticing of insects, but which
fertilize themselves with their own pollen, produce abundant seed
close to the ground or under it.Then what need of the showy
blossoms hanging in the thicket above? Close inbreeding in the
vegetable world, as in the animal, ultimately produces degenerate
offspring; and although the showy lilac blossoms of the wild
peanut yield comparatively few cross-fertilized seeds, these are
quite sufficient to enable the vine to maintain those desired
features which are the inheritance from ancestors that struggled
in their day and generation after perfection. No plant dares
depend upon its cleistogamous or blind flowers alone for
offspring; and in the sixty or more genera containing these
curious growths, that usually look like buds arrested in
development, every plant that bears them bears also showy flowers
dependent upon cross-pollination by insect aid.
Pages:
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91