The Kansas University Science Bulletin (Vol. I, No. 1)Various
Science
The Kansas University Science Bulletin (Vol. I, No. 1)
Various
Science -- Periodicals
_Apis mellifica_ Linn. Lake View, August 7. Seven specimens.
_Agapostemon texanus_ Cress. Lake View, August 7.
_Mellisoides bimaculata_ (St. Farg) Lepl. Lake View, August 7.
_Megachile petulans_ Cress. Lake View, August 7.
_Bombus separatus_ Cress. Lake View, August 7.
As in the case of _Solanum_, it will be seen that the collecting period
extended over a very short period of time. More search would doubtless
greatly increase the list.
Robertson reports the following species as collecting pollen: _Bombus
virginicus_ Oliv., _B. separatus_ Cress., _B. americanorum_ F., and _B.
scutellaris_ Cress.
August 28, when the blossoming season for _C. chamæcrista_ was almost
over, an examination of material from the above-named region was made
for the purpose of determining the number of seeds produced by a single
plant. Fifteen pods were selected at random from different plants and
the number of ovules counted. It was impossible to tell about the
number in each pod which were fully and normally developed seeds or
which would become such; consequently this factor is not taken into
consideration. The percentage of ovules which fail to develop is,
however, small. The number of seeds found to the pod is shown by the
following:
TABLE F.
Pod I, 13 seeds.
II, 14 "
III, 11 "
IV, 11 "
V, 10 "
VI, 12 "
VII, 16 "
VIII, 12 "
IX, 8 "
X, 14 "
XI, 17 "
XII, 18 "
XIII, 17 "
XIV, 15 "
XV, 14 "
————
Total XV, 202 seeds,
or 13.4 per pod.
From this it will be seen that the minimum number of seeds found was
8, the maximum 18, with an average of 13.4. Since the pods were simply
gathered at random, there is no certainty of gaining the maximum or
minimum number of seeds, but a fair average of the number produced
may be expected. September 4 three plants were examined to determine
something about the range of variation in the number of ovules produced
in the pods of a single plant. The results are given as follows:
Plant 1 varies from 5 to 11.
Plant 2 varies from 8 to 18.
Plant 3 varies from 9 to 14.
Plant 1 had 35 pods, plant 2 had 64, and plant 3 had 27.
Plant 1 was selected on account of the small
number of seeds produced per pod.
It will be seen from table D that an average of nearly 3.3 flower
buds per cluster is produced. These were moderate-sized, healthy
plants, producing on the whole probably more than the average number
of clusters per plant. On the ten plants, there were produced 342
clusters, which bore 344 seed pods, instead of about 1120, the number
of flowers which might be expected, thus giving less than thirty-three
per cent. of the buds which produce mature seed pods.
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