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Darwin, Charles, 1809-1882

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


Petunia violacea (Fourth generation).
Although the crossed plants were to the self-fertilised in height as 100
to 69, yet in three out of the five pots a self-fertilised plant
flowered first; in the fourth pot simultaneously, and only in the fifth
did a crossed plant flower first.
Nicotiana tabacum (First Generation).
The crossed plants were to the self-fertilised in height only as 100 to
178, and a self-fertilised plant flowered first in all four pots.
Nicotiana tabacum (Third Generation).
The crossed plants were to the self-fertilised in height as 100 to 101,
and in four out of the five pots a self-fertilised plant flowered first.
Canna warscewiczi.
In the three generations taken together the crossed were to the
self-fertilised in height as 100 to 101; in the first generation the
self-fertilised plants showed some tendency to flower first, and in the
third generation they flowered first in nine out of the twelve pots.
SPECIES IN WHICH THE CROSSED AND SELF-FERTILISED PLANTS FLOWERED ALMOST
SIMULTANEOUSLY.
Mimulus luteus (Sixth Generation).
The crossed plants were inferior in height and vigour to the
self-fertilised plants, which all belonged to the new white-flowered
tall variety, yet in only half the pots did the self-fertilised plants
flower first, and in the other half the crossed plants.
Viscaria oculata.
The crossed plants were only a little taller than the self-fertilised
(namely, as 100 to 97), but considerably more fertile, yet both lots
flowered almost simultaneously.


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