Comparison with 1859 |
|
of the seeds in the ray-florets in some Compositæ countenances this idea; but, in the case
of the corolla of
the Umbelliferæ, it is by no means, as Dr. Hooker informs me, in
species with the densest heads that the inner and outer flowers
most frequently differ. It might have been thought that the development of the ray-petals by drawing nourishment from certain other parts of the flower had
caused
their abortion; but in
some Compositæ there is a difference in
the seeds of the outer and inner florets without
any difference in the corolla.
Possibly, Possibly, 1859 1860 | Possibly 1861 1866 1869 1872 |
these several differences
may be connected with some
difference
in the
flow of nutriment towards the central and external flowers: we know, at least, that in
irregular flowers, those nearest to the axis are
oftenest oftenest 1859 1860 |
said to be oftenest 1861 1866 |
most 1869 1872 |
subject to peloria, and become regular.
I may add, as an instance of this,
and of
a striking case of correlation, that I have recently observed in some garden pelargoniums, that
the
central flower of the truss
often loses the patches of darker colour in the two upper petals; and that
when this occurs, the adherent nectary is quite aborted;
when the
colour is absent from only one of the two upper petals, the nectary is only
much shortened. |
|
With respect to the difference in
the corolla
of the central and exterior flowers of a head or umbel, I do not feel at all sure that C. C.
Sprengel's
idea that the ray-florets serve to attract insects, whose agency is highly advantageous in
the fertilisation of plants of these two orders, is so far-fetched, as it may at first appear:
and if it be advantageous,
natural selection may have come into play. But in regard
to the differences both in the internal and external structure of the seeds, which are not always correlated with any differences in the
flowers, it seems impossible that they
can be in any way advantageous to the plant:
yet in the
|
of the
seeds in the ray-florets in some Compositæ countenances this idea; but, in the case seeds in the ray-florets in some Compositæ countenances this idea; but, in the case 1859 1860 1861 1866 |
involucra on the florets, or to their mutual pressure, and the shape 1869 1872 |
of the
corolla of corolla of 1859 1860 1861 1866 |
seeds in the ray-florets of some Compositæ countenances this idea; but with 1869 1872 |
the Umbelliferæ, it is by no means, as Dr. Hooker informs me,
in in 1859 1860 1861 1866 | the 1869 1872 |
species with the densest heads
that the inner and outer flowers that the inner and outer flowers 1859 1860 1861 1866 |
which 1869 1872 |
most frequently
differ. differ. 1859 1860 1861 1866 |
differ in their inner and outer flowers. 1869 1872 |
It might have been thought that the development of the ray-petals by drawing nourishment from
certain other parts of the flower had certain other parts of the flower had 1859 1860 1861 1866 |
the reproductive organs had 1869 |
the reproductive organs 1872 |
caused caused 1859 1860 1861 1866 1869 | causes 1872 |
their abortion; but
in in 1859 1860 1861 1866 |
this can hardly be the sole cause, for in 1869 1872 |
some Compositæ
there is a difference in there is a difference in 1859 1860 1861 1866 |
OMIT 1869 1872 |
the seeds of the outer and inner florets
without without 1859 1860 1861 1866 | differ without 1869 | differ, without 1872 |
any difference in the corolla.
Possibly Possibly 1861 1866 1869 1872 | Possibly, 1859 1860 |
these several
differences differences 1859 1860 1861 1869 1872 | differ- ences 1866 |
may be connected with
some some 1859 1860 1861 1866 | the 1869 1872 |
difference difference 1859 1860 1861 1866 | different 1869 1872 |
in the in the 1859 1860 1861 1866 | in the 1869 1872 |
flow of nutriment towards the central and external flowers: we know, at least, that
in in 1859 1860 1861 1866 | with normally 1869 | with 1872 |
irregular flowers, those nearest to the axis are
said to be oftenest said to be oftenest 1861 1866 |
oftenest 1859 1860 |
most 1869 1872 |
subject to peloria,
and become regular. and become regular. 1859 1860 1861 1866 |
that is they become symmetrical. 1869 |
that is to become abnormally symmetrical. 1872 |
I may add, as an instance of
this, this, 1859 1860 1861 1866 1869 | this 1872 |
and of and of 1859 1860 1861 1866 1869 |
fact, and as 1872 |
a striking case of correlation, that
I have recently observed in some garden pelargoniums, that I have recently observed in some garden pelargoniums, that 1859 1860 1861 1866 |
I have recently observed in many pelargoniums, that 1869 |
in many pelargoniums, the two upper petals in 1872 |
the the 1859 1860 1861 1866 1872 | in the 1869 |
central flower of the
truss truss 1859 1860 1861 1866 1872 | truss, 1869 |
often loses the patches of darker colour in the two upper petals; and that often loses the patches of darker colour in the two upper petals; and that 1859 1860 1861 |
often loses the patches of darker colour in the two upper petals; and that, 1866 |
the two upper petals often lose their patches of darker colour; and 1869 |
often lose their patches of darker colour; and 1872 |
when this occurs, the adherent nectary is quite
aborted; aborted; 1859 1860 1861 1866 1872 | aborted. 1869 |
when the when the 1859 1860 1861 1866 |
When the 1869 |
the central flower thus becoming peloric or regular. When the 1872 |
colour is absent from only one of the two upper petals, the nectary is
only only 1859 1860 1861 1866 |
not quite aborted but is 1869 1872 |
much shortened. |
|
With respect to the
difference in difference in 1859 1860 1861 1866 | development of 1869 1872 |
the
corolla corolla 1859 1860 1861 1866 1869 | corolla, 1872 |
of the central and exterior flowers of a head or umbel, I do not feel at all sure that C. c. of the central and exterior flowers of a head or umbel, I do not feel at all sure that C. c. 1859 1860 1861 |
of the central and exterior flowers of a head or umbel, I do not feel at all sure that c. c. 1866 |
in the central and exterior flowers, 1869 |
OMIT 1872 |
Sprengel's Sprengel's 1859 1860 1861 1866 1872 | Sprengels 1869 |
idea that the ray-florets serve to attract insects, whose agency is highly advantageous
in in 1859 1860 1861 1866 |
or necessary for 1869 1872 |
the fertilisation of
plants of these two orders, is so far-fetched, as it may at first appear: plants of these two orders, is so far-fetched, as it may at first appear: 1859 1860 1861 |
plants of these two orders, is so far-fetched as it may at first appear: 1866 |
these plants, is highly probable; 1869 1872 |
and if
it be advantageous, it be advantageous, 1859 1860 1861 1866 |
so, 1869 1872 |
natural selection may have come into play. But
in regard in regard 1859 1860 1861 1866 | with respect 1869 1872 |
to the
differences both in the internal and external structure of the seeds, which are not always correlated with any differences in the differences both in the internal and external structure of the seeds, which are not always correlated with any differences in the 1859 1860 1861 |
differences in the 1866 |
seeds, it seems impossible that their differences in shape, which are not always correlated with any difference in the 1869 1872 |
flowers, it seems impossible that they flowers, it seems impossible that they 1859 1860 1861 1866 |
corolla, 1869 1872 |
can be in any way
advantageous to the plant: advantageous to the plant: 1859 1860 1861 1866 |
beneficial: 1869 |
beneficial; 1872 |
yet in the
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