Archamamelis,hamamelidalean flowers from the Upper Cretaceous of Sweden |
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Authors: | P. K. Endress Else Marie Friis |
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Affiliation: | (1) Institut für Systematische Botanik der Universität, Zollikerstrasse 107, CH-8008 Zürich, Switzerland;(2) Naturhistoriska Riksmuseet, Sektionen för Paleobotanik, S-104 05 Stockholm 50, Sweden |
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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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Keywords: | Angiosperms Archamamelis Hamamelidaceae Hamamelidales Hamamelididae Cretaceous flowers Cretaceous pollen Palaeoflora of Sweden |
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