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Darwin, Charles, 1809-1882

"Effects of Cross and Self Fertilisation in the Vegetable Kingdom"


[SPECIES, OF WHICH THE FIRST PLANTS THAT FLOWERED WERE OF CROSSED
PARENTAGE.
Ipomoea purpurea.
I record in my notes that in all ten generations many of the crossed
plants flowered before the self-fertilised; but no details were kept.
Mimulus luteus (First Generation).
Ten flowers on the crossed plants were fully expanded before one on the
self-fertilised.
Mimulus luteus (Second and Third Generation).
In both these generations a crossed plant flowered before one of the
self-fertilised in all three pots.
Mimulus luteus (Fifth Generation).
In all three pots a crossed plant flowered first; yet the
self-fertilised plants, which belonged to the new tall variety, were in
height to the crossed as 126 to 100.
Mimulus luteus.
Plants derived from a cross with a fresh stock as well as the
intercrossed plants of the old stock, flowered before the
self-fertilised plants in nine out of the ten pots.
Salvia coccinea.
A crossed plant flowered before any one of the self-fertilised in all
three pots.
Origanum vulgare.
During two successive seasons several crossed plants flowered before the
self-fertilised.
Brassica oleracea (First Generation).
All the crossed plants growing in pots and in the open ground flowered
first.
Brassica oleracea (Second Generation).
A crossed plant in three out of the four pots flowered before any one of
the self-fertilised.


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