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Related Concept Videos

Introduction to Plant Diversity02:22

Introduction to Plant Diversity

From Water to Land
Introduction to Seed Plants03:40

Introduction to Seed Plants

Most plants are seed plants—characterized by seeds, pollen, and reduced gametophytes. Seed plants include gymnosperms and angiosperms.
Non-vascular Seedless Plants02:26

Non-vascular Seedless Plants

The diverse plant life on Earth—consisting of nearly 400,000 species—can be divided into three broad categories based on biological characteristics: nonvascular, seedless vascular, and seed plants.
Seedless Vascular Plants03:24

Seedless Vascular Plants

Seedless Vascular Plants Were the First Tall Plants on Earth
Phylogeny01:23

Phylogeny

Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
Phylogenetic Trees03:21

Phylogenetic Trees

Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.

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Updated: May 9, 2026

Reliable Method for Assessing Seed Germination, Dormancy, and Mortality under Field Conditions
07:03

Reliable Method for Assessing Seed Germination, Dormancy, and Mortality under Field Conditions

Published on: November 6, 2016

Surviving ancestors, hard polytomies, and seed plant evolution.

Susanne S Renner1, Guido Grimm2, Dmitry D Sokoloff3

  • 1Department of Biology, Washington University in Saint Louis, MO 63130, USA.

Evolution; International Journal of Organic Evolution
|May 8, 2026
PubMed
Summary

Phylogenetic analysis of seed plants remains unresolved. New visualization tools like networks and Romerograms offer novel ways to represent complex evolutionary relationships, potentially overcoming limitations of traditional cladograms.

Keywords:
AncestorsGnetalesRomerogramscladogramsheuristic data visualizationspindle diagramssplits graphs networkstrue polytomies

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Area of Science:

  • Evolutionary Biology
  • Phylogenetics
  • Paleobotany

Background:

  • Forty years of phylogenetic analysis have not resolved relationships among major seed plant groups.
  • The fossil record indicates more extinct seed plant groups than extant ones, with potential survival of ancient ancestors.
  • Traditional phylogenetic methods may be insufficient for complex evolutionary histories.

Purpose of the Study:

  • To reanalyze morphological data for seed plant relationships using novel visualization techniques.
  • To explore the utility of networks and Romerograms in depicting phylogenetic uncertainty and ancestral lineages.
  • To challenge the limitations of strictly dichotomous tree representations in phylogenetics.

Main Methods:

  • Reanalysis of morphological matrices for seed plants.
  • Application of network visualizations to display incompatible phylogenetic signals.
  • Utilized Romerograms (spindle diagrams) to represent alternative relationships and ancestral survival.
  • Simulated ancestral data to test network efficacy in identifying potential ancestors.

Main Results:

  • Networks effectively display conflicting phylogenetic signals within seed plant data.
  • Romerograms provide a heuristic method for visualizing complex evolutionary hypotheses, including budding speciation and surviving ancestors.
  • Simulated ancestor experiments suggest networks can help pinpoint surviving lineages.
  • The study highlights limitations of focusing solely on sister group identification in cladograms.

Conclusions:

  • Novel visualization tools, networks and Romerograms, offer promising approaches to resolve seed plant phylogeny.
  • Overcoming the impasse in seed plant phylogenetics requires broadening data visualization methods beyond dichotomous trees.
  • Further research into identifying true evolutionary polytomies is warranted, aided by advanced visualization techniques.