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The phylogenetic position of Gnetales is one of the most contentious issues in the seed plant systematics. To elucidate the… Expand The exact phylogenetic position of Gnetales, a small, highly modified group of gymnosperms with an accelerated rate of molecular… Expand Over the past 25 years the discovery and study of Cretaceous plant mesofossils has yielded diverse and exquisitely preserved… Expand Flowers consist primarily of four basic organ types whose relative positions are universally conserved within the angiosperms. A… Expand Genomic comparisons provide evidence for ancient genome-wide duplications in a diverse array of animals and plants. We developed… Expand Efforts to resolve Darwin's "abominable mystery"-the origin of angiosperms-have led to the conclusion that Gnetales and various… Expand Phylogenetic relationships among the five groups of extant seed plants are presently quite unclear. For example, morphological… Expand Angiosperms have dominated the Earth's vegetation since the mid-Cretaceous (90 million years ago), providing much of our food… Expand Morphological analyses of seed plant phylogeny agree that Gnetales are the closest living relatives of angiosperms, but some… Expand We present the results of two exploratory parsimony analyses of DNA sequences from 475 and 499 species of seed plants… Expand