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Darwin, Charles, 1809-1882

"The Different Forms of Flowers on Plants of the Same Species"


[PLANT 14.
This short-styled plant was allowed during 1865 to be freely and legitimately
fertilised by illegitimate plants descended from self-fertilised mid-, long- and
short-styled plants. Fifteen capsules yielded an average of 28.3 seeds, with a
maximum of 51 and a minimum of 11; hence this plant produced only 33 per cent of
the proper number of seeds. The seeds themselves were small and irregular in
shape. Although so sterile on the female side, none of the anthers were
contabescent.
PLANT 15.
This short-styled plant, treated like the last during the same year, yielded an
average, from fifteen capsules, of 27 seeds, with a maximum of 49 and a minimum
of 7. But two poor capsules may be rejected, and then the average rises to 32.6,
with the same maximum of 49 and a minimum of 20; so that this plant attained 38
per cent of the normal standard of fertility, and was rather more fertile than
the last, yet many of the anthers were contabescent.
PLANT 16.
This short-styled plant, treated like the two last, yielded from ten capsules an
average of 77.8 seeds, with a maximum of 97 and a minimum of 60; so that this
plant produced 94 per cent of the full number of seeds.
PLANT 17.
This, the one long-styled plant of the same parentage as the last three plants,
when freely and legitimately fertilised in the same manner as the last, yielded
an average from ten capsules of 76.


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