Abstract
Lignite fossil flowers (including pollen) and isolated stamens of probable hamamelidalean (possible hamamelidaceous) affinities from the upper Cretaceous (Late Santonian or Early Campanian) of Sweden are described. The flowers are 6–7-merous with probably a double perianth, one whorl of stamens and (2-?)3 carpels. The stamens are disporangiate; each theca opens by a valve towards the centre of the flower. Pollen is tricolpate, tectate-columellate and reticulate; the endexine is lamellated in the apertural region. The gynoecium has free styles and a syncarpous ovary. In the one flower that was serially sectioned the ovary is either non-functional or development of the few (2?) ovules is retarded.
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Endress, P.K., Friis, E.M. Archamamelis, hamamelidalean flowers from the Upper Cretaceous of Sweden. Pl Syst Evol 175, 101–114 (1991). https://doi.org/10.1007/BF00942149
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DOI: https://doi.org/10.1007/BF00942149