Flowers of Turonian Magnoliidae and their implications
Flowers of Turonian Magnoliidae and their implications
复制标题
土伦木兰科的花朵及其意义
DOI：
10.1007/978-3-7091-6910-0_5
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
K. Nixon
中科院分区：
文献类型：
--
作者：
W. Crepet;K. Nixon
Recently discovered fossil flowers ofMagnoliidaefrom Atlantic Coastal Plain deposits of Turonian age are considered in the context of the overall fossil record of magnoliid reproductive remains. The assemblage of fossils from these Turonian localities is diverse and affects our understanding of the history of reproductive structures in theMagnoliidae(and in the angiosperms in general). WithinPiperales(sensuCronquist1981), they include the earliest stamens similar to those of modernChloranthus. Turonian fossilMagnolialesdocument early diversity of complicated flowers with numerous spirally arranged organs and laminar stamens and also reveal diversity inMagnolialeswith cupulate floral receptacles. InLaurales, there are two taxa of fossil flowers ofLauraceae, and a fossil flower sharing some, but not all, characters withCalycanthaceae. In the context of the overall Cretaceous record of angiosperms, these fossils have important implications with respect to the sequence of appearance of disparate types of floral morphology inMagnoliidae. They also reveal diversity in character complexes now associated with several different modes of insect pollination and suggest that during the Turonian, passive (e.g., wind) dispersal of seeds was important in magnoliid taxa.
