Thirty-two flowers were fertilised
with their own pollen, and produced only six capsules, each with five
seeds. So that the crossed and self-fertilised capsules contained the
same number of seeds, though many more capsules were produced by the
cross-fertilised than by the self-fertilised flowers, in the ratio of
100 to 21.
An equal number of seeds of both lots were weighed, and the crossed
seeds were to the self-fertilised in weight as 100 to 82. Therefore a
cross increases the number of capsules produced and the weight of the
seeds, but not the number of seeds in each capsule.
These two lots of seeds, after germinating on sand, were planted on the
opposite sides of three pots. The seedlings when from 6 to 7 inches in
height were equal. The plants were measured when fully grown, but their
heights were so unequal in the several pots, that the result cannot be
fully trusted.
TABLE 5/75. Nolana prostrata.
Heights of plants measured in inches.
Column 1: Number (Name) of Pot.
Column 2: Crossed Plants.
Column 3: Self-fertilised Plants.
Pot 1 : 8 4/8 : 4 2/8.
Pot 1 : 6 4/8 : 7 4/8.
Pot 2 : 10 4/8 : 14 4/8.
Pot 2 : 18 : 18.
Pot 3 : 20 2/8 : 22 6/8.
Total : 63.75 : 67.00.
The five crossed plants average 12.75, and the five self-fertilised 13.4
inches in height; or as 100 to 105.
CHAPTER VI.
SOLANACEAE, PRIMULACEAE, POLYGONEAE, ETC.
Pages:
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286