(5/24. Gartner has shown that certain
plants of Lobelia fulgens are quite sterile with pollen from the same
plant, though this pollen is efficient on any other individual; but none
of the plants on which I experimented, which were kept in the
greenhouse, were in this peculiar condition.)
As the seeds obtained by the above two methods would not germinate when
left on bare sand, they were sown on the opposite sides of four pots;
but I succeeded in raising only a single pair of seedlings of the same
age in each pot. The self-fertilised seedlings, when only a few inches
in height, were in most of the pots taller than their opponents; and
they flowered so much earlier in all the pots, that the height of the
flower-stems could be fairly compared only in Pots 1 and 2.
TABLE 5/70. Lobelia fulgens (First Generation).
Heights of flower-stems measured in inches.
Column 1: Number (Name) of Pot.
Column 2: Height of Flower-stems on the Crossed Plants.
Column 3: Height of Flower-stems on the Self-fertilised Plants.
Pot 1 : 33 : 50.
Pot 2 : 36 4/8 : 38 4/8.
Pot 3 : 21* : 43.
Pot 4 : 12* : 35 6/8.
*Not in full flower.
The mean height of the flower-stems of the two crossed plants in Pots 1
and 2 is here 34.75 inches, and that of the two self-fertilised plants
in the same pots 44.25 inches; or as 100 to 127. The self-fertilised
plants in Pots 3 and 4 were in every respect very much finer than the
crossed plants.
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