Short-styled by own-form pollen. Illegitimate union :
17 : 3 : 19 : 9 : 12.1.

SUMMARY:

The two legitimate unions together :
20 : 14 : 62 : 37 : 47.1.

The two illegitimate unions together :
37 : 7 : 49* : 2 : 35.5.
(*These seeds were so poor and small that they could hardly have germinated.)

If we compare the fertility of the two legitimate unions taken together with
that of the two illegitimate unions together, as judged by the proportional
number of flowers which when fertilised in the two methods yielded capsules, the
ratio is as 100 to 27; so that by this standard the present species is much more
sterile than P. veris, when both species are illegitimately fertilised. If we
judge of the relative fertility of the two kinds of unions by the average number
of seeds per capsule, the ratio is as 100 to 75. But this latter number is
probably much too high, as many of the seeds produced by the illegitimately
fertilised long-styled flowers were so small that they probably would not have
germinated, and ought not to have been counted. Several long-styled and short-
styled plants were protected from the access of insects, and must have been
spontaneously self-fertilised. They yielded altogether only six capsules,
containing any seeds; and their average number was only 7.8 per capsule. Some,
moreover, of these seeds were so small that they could hardly have germinated.

Herr W. Breitenbach informs me that he examined, in two sites near the Lippe (a
tributary of the Rhine), 894 flowers produced by 198 plants of this species; and