Molecular Phylogenetics and Taxonomy of Euphorbiaceae
Summary
Molecular phylogenetics has transformed the classification of Euphorbiaceae by combining DNA sequence data from plastid and nuclear genomes to reconstruct evolutionary relationships. This large and diverse family, comprising some 300 genera and 8 000 species of herbs, shrubs and trees, exhibits complex morphological variation and wide geographic distribution across tropical and subtropical regions. Early morphology-based taxonomies often failed to reflect true phylogenetic affinities, leading to polyphyletic or paraphyletic groupings. Modern studies utilise multiple genetic markers—such as plastid genes (rbcL, trnL-F) and nuclear ribosomal regions (ITS, ETS)—to produce robust phylogenies. These analyses have clarified generic limits, revealed deep splits among subfamilies (Acalyphoideae, Crotonoideae, Euphorbioideae) and prompted the reinstatement, circumscription or merging of tribes and genera. Integrating molecular evidence with morphological synapomorphies has yielded a more stable classification, facilitating biogeographical inferences and informing conservation strategies for economically and ecologically important taxa, such as castor bean, cassava and ornamental Euphorbia species.
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Molecular Phylogenetics and Taxonomy of Euphorbiaceae publication trend
The graph below shows the total number of articles in molecular phylogenetics and taxonomy of euphorbiaceae across all publications each year (not limited to Nature Index journals).
Technical terms
Molecular phylogenetics: Analysis of DNA or protein sequences to infer evolutionary relationships.
Plastid marker: DNA sequence from chloroplast genomes commonly used in plant phylogeny.
Internal transcribed spacer (ITS): Nuclear ribosomal DNA region situated between rRNA genes, highly variable for species-level studies.
Paraphyly: A group that includes a common ancestor but not all its descendants.
Synapomorphy: A shared derived character that defines a clade.
Tribe: A taxonomic rank between subfamily and genus used to organise related genera.
References
- Systematics of Ditaxinae and Related Lineages within the Subfamily Acalyphoideae (Euphorbiaceae) Based on Molecular Phylogenetics. Biology (2023).
- Phylogenetic Reconstruction of the Rainforest Lineage Fontainea Heckel (Euphorbiaceae) Based on Chloroplast DNA Sequences and Reduced-Representation SNP Markers. Diversity (2022).
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