ABSTRACT
This chapter explores the benefit of heterostyled dimorphic plants derive from the existence of the two forms is sufficiently obvious, the intercrossing of distinct plants being thus ensured. It is well known that if pollen from a distinct species be placed on the stigma of a plant, and some hours afterwards its own pollen be placed on it, the latter will be prepotent and will quite obliterate any effect from the foreign pollen; and there can hardly be a doubt that with heterostyled dimorphic plants, pollen from the other form will obligate the effects of pollen from the same form, even when this has been placed on the stigma a considerable time before. To test this belief, it placed on several stigmas of a long-styled cowslip plenty of pollen from the same plant, and after twenty-four hours added some from a short-styled dark-red polyanthus, which is a variety of the cowslip.
