Annals of Botany · 2004 · 52 citations · 41 references
The new Permian cone has unequivocal affinity with the Gnetales. The fossil has considerably extended the divergence time of the Gnetales from 140 (210?) back to 270 myr ago and, therefore, provides the first significant fossil evidence to support the current conclusion based on molecular data of seed plants, i.e. monophyletic gymnosperms, comprising the Gnetales are closely related to conifers.
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The earliest angiosperms: evidence from mitochondrial, plastid and nuclear genomes
Yin‐Long Qiu, Jung-Ho Lee, Fabiana Bernasconi‐Quadroni et al. · Nature · 1999 · 868 citations
The origin and early diversification of angiosperms
Peter R. Crane, Else Marie Friis, Kaj Raunsgaard Pedersen · Nature · 1995 · 778 citations
The Biology and Evolution of Fossil Plants
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