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The Different Forms of Flowers on Plants of the Same Species by Charles Darwin
page 22 of 371 (05%)

So that, by all these standards of comparison, the short-styled form is the more
fertile; if we take the number of umbels (which is the fairest standard, for
large and small plants are thus equalised), the short-styled plants produce more
seed than the long-styled, in the proportion of nearly four to three.

In 1861 the trial was made in a fuller and fairer manner. A number of wild
plants had been transplanted during the previous autumn into a large bed in my
garden, and all were treated alike; the result was:--

TABLE 1.3.

Column 1: Plant.
Column 2: Number of Plants.
Column 3: Number of Umbels.
Column 4: Weight of Seed in grains.

Short-styled cowslips : 47 : 173 : 745.
Long-styled cowslips : 58 : 208 : 692.

These figures give us the following proportions:--

TABLE 1.4.

Column 1: Plant.
Column 2: Number of Plants.
Column 3: Weight of Seed in grains.
...
Column 4: Number of Umbels.
Column 5: Weight of Seed in grains.
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