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Darwin, Charles, 1809-1882

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

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CLASS 7. ILLEGITIMATE PLANTS RAISED FROM MID-STYLED PARENTS FERTILISED WITH
POLLEN FROM THE LONGEST STAMENS OF THE SHORT-STYLED FORM.
It was shown in the last chapter that the union from which these illegitimate
plants were raised is far more fertile than any other illegitimate union; for
the mid-styled parent, when thus fertilised, yielded an average (all very poor
capsules being excluded) of 102.8 seeds, with a maximum of 130; and the
seedlings in the present class likewise have their fertility not at all
lessened. Forty plants were raised; and these attained their full height and
were covered with seed-capsules. Nor did I observe any contabescent anthers. It
deserves, also, particular notice that these plants, differently from what
occurred in any of the previous classes, consisted of all three forms, namely,
eighteen short-styled, fourteen long-styled, and eight mid-styled plants. As
these plants were so fertile, I counted the seeds only in the two following
cases.
[PLANT 32.
This mid-styled plant was freely and legitimately fertilised during the
unfavourable year of 1864, by numerous surrounding legitimate and illegitimate
plants. Eight capsules yielded an average of 127.2 seeds, with a maximum of 144
and a minimum of 96; so that this plant attained 98 per cent of the normal
standard.
PLANT 33.


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