Seed plant phylogeny and the origin of angiosperms: an experimental cladistic approach

TitleSeed plant phylogeny and the origin of angiosperms: an experimental cladistic approach
Publication TypeJournal Article
Year of Publication1986
AuthorsDoyle JA, Donoghue MJ
JournalBotanical Review
Volume52
Pagination321-431
ISSN00068101
KeywordsBiological Sciences, Botany & Plant Sciences
Abstract

We present a numerical cladistic (parsimony) analysis of seed plants plus progymnosperms, using characters from all parts of the plant body, outgroup comparison, and a method of character coding that avoids biases for or against alternative morphological theories. The robustness of the results was tested by construction of alternative trees and analysis of subsets of the data. These experiments show that although some clades are strongly supported, they can often be related to each other in very different but nearly equally parsimonious ways, apparently because of extensive homoplasy. Our results support Rothwell’s idea that coniferopsids are derived from Callistophyton-like platyspermic seed ferns with saccate pollen, but the hypothesis that they evolved from Archaeopteris-like progymnosperms and the seed arose twice is nearly as parsimonious. Meyen’s division of seed plants into radiospermic and primarily and secondarily platyspermic lines is highly unparsimonious, but his suggestio

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