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Pollen dimorphism in Ephedra L.(Ephedraceae)


John J Skvarla, Stephanie M Ickert-Bond, and William F Chissoe, Pollen dimorphism in Ephedra L.(Ephedraceae): .


The pollen of three Ephedra taxa, Ephedra torreyana, E. trifurca and E. funerealeft right double arrowE. torreyana, showed a marked pollen dimorphism when examined using scanning electron microscopy. Typical pollen grains in all of these taxa have straight ridges, but the variant forms exhibit a highly folded ectexine. In addition, previously used characters such as the presence or absence of bifurcating valley structure do not appear to be uniform, even within a single microsporangium, suggesting that their value to taxonomic study should be reassessed. Published in Review of Palaeobotany and Palynology, volume 124, issue 3-4, on pages 325 - 334, in 2003.


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  • Upper Colorado River Basin



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