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1(54
difTerence aniounled to even 14 niillimet. As regards this variation,
too, it can be added that the flowers ön the same cf-bush
gene-rally group themselves möre equably about their average size,
while, in the case of one and the same Q-bush, single flowers often
distinguish themselves in size from the others, thereby displacing
the average size of these flowers. This last-named circumstance,
too, can also possibly be regarded as a, perhaps weak secondary
sexual characteristic.
In spite of the variation in the size of the flowers ön the same
bush, the individuals can be divided into difierent classes of size.
I have found that, of the 210 bushes, the highest size-class—with
an average size per bush of 28—28,9 millimet. — was reached by
the cf-individuals, while the highest in the case of the
Q-indivi-duals was characterized by an average size per bush that amounted
to only 26—26,9 millimet. Of the cf-bushes, 2(1 reached the
size-class of 21—21,9 millimet., and of the Q-bushes, 16 reached the
size-class of 20—20,9 millimet. This measurement, too, is thus in
favour of the cf-sex.
To this may be added, that the variation in the size oftheflower
in respect to the average size of the 1’lower in P. fruticosa
is considerably greater than in P. argentea, P. anserina and P. erecta,
with which I also undertook measurements. Möre definitely, the
power ol variation in question shown by P. fruticosa is not less
than nearly twice as great as in the P. anserina and P. erecta, bolh
of which varv verv greatly.
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