. Bulletin of the British Museum (Natural History) Botany. 120 N. K. B. ROBSON height is not great; but in the more advanced flower of H. perforatum, for example, it is considerable (Fig. 30b). This relationship between stamen length and stigma level ( style + ovary length) appears to exist in most open-pollinated species of Hypericum. In some 'wide' hybrids ( H. x moseranum Luquet ex Andre and H. 'Hidcote', both sect. 3. Ascyreia), however, the anthers do not ever reach the level of the stigmas, which indicates that the mating of two species with distinct floral structures has resulte
. Bulletin of the British Museum (Natural History) Botany. 120 N. K. B. ROBSON height is not great; but in the more advanced flower of H. perforatum, for example, it is considerable (Fig. 30b). This relationship between stamen length and stigma level ( style + ovary length) appears to exist in most open-pollinated species of Hypericum. In some 'wide' hybrids ( H. x moseranum Luquet ex Andre and H. 'Hidcote', both sect. 3. Ascyreia), however, the anthers do not ever reach the level of the stigmas, which indicates that the mating of two species with distinct floral structures has resulted in biological disfunction (quite apart from any genetical or chromosomal disfunction that has occurred). A second exception is found in at least some species of sect. 29. Brathys ( H. laricifolium), in which the stamens fall far short of the stigmatic level. From the observation that the filaments in such flowers are rather thick and crumpled, however, it would seem that they have under- gone some sort of contraction, possibly associated with self-pollination at Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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