Sinensis. We may further infer that the short-styled form is not rendered
quite sterile by a long course of fertilisation with pollen of the same form:
but as there would always be some liability to an occasional cross with the
other form, we cannot tell how long self-fertilisation has been continued.
Primula farinosa.
Mr. Scott says that it is not at all uncommon to find equal-styled plants of
this heterostyled species. (5/9. 'Journal of the Proceedings of the Linnean
Society' 8 1864 page 115.) Judging from the size of the pollen-grains, these
plants owe their structure, as in the case of P. auricula, to the abnormal
elongation of the stamens of the long-styled form. In accordance with this view,
they yield less seed when crossed with the long-styled form than with the short-
styled. But they differ in an anomalous manner from the equal-styled plants of
P. auricula in being extremely sterile with their own pollen.
Primula elatior.
It was shown in the first chapter, on the authority of Herr Breitenbach, that
equal-styled flowers are occasionally found on this species whilst growing in a
state of nature; and this is the only instance of such an occurrence known to
me, with the exception of some wild plants of the Oxlip--a hybrid between P.
veris and vulgaris--which were equal-styled. Herr Breitenbach's case is
remarkable in another way; for equal-styled flowers were found in two instances
on plants which bore both long-styled and short-styled flowers.
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