Phylogenetic Systematics of Boraginaceae

The Boraginaceae, commonly known as the borage or forget-me-not family, comprises over 2 000 species distributed worldwide in temperate to tropical regions. Phylogenetic systematics has transformed our understanding of this group by integrating morphological characters with multilocus DNA data, including nuclear ribosomal markers and plastid genes. Early classifications based on floral and fruit anatomy have given way to robust molecular phylogenies that resolve relationships at tribal and subfamilial levels. These studies confirm the monophyly of core clades such as Boragineae and Lithospermeae while revealing unexpected affinities with formerly segregated families (for example Cordiaceae and Heliotropiaceae) under the order Boraginales. Comprehensive plastome analyses have further illuminated genome structural variation—such as inverted-repeat expansion—and provided high-resolution markers for species delimitation. Divergence-time estimates place major radiations in the Eocene and Miocene, often associated with shifts in climate and the repeated evolution of C4 photosynthesis in genera like Euploca. Insights from phylogenetic systematics underpin taxonomic revisions, guide conservation of rare endemics, and inform the discovery of bioactive compounds in medicinal taxa. Ongoing efforts aim to sample underrepresented lineages and to reconcile morphology with genomics in a fully resolved evolutionary framework.

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Phylogenetic Systematics of Boraginaceae publication trend

The graph below shows the total number of articles in phylogenetic systematics of boraginaceae across all publications each year (not limited to Nature Index journals).

Technical terms

Phylogenetic systematics: The study of evolutionary relationships and classification based on shared ancestry inferred from morphological and molecular data.

Plastome: The complete genome of a plastid (chloroplast), often used in plant phylogenetics for its conserved structure and gene content.

Monophyly: A group of organisms that consists of an ancestor and all its descendants, forming a single branch on the tree of life.

Homoplasy: The occurrence of similar traits in different lineages due to convergent evolution or evolutionary reversal rather than common ancestry.

Codon usage bias: The non-random usage of synonymous codons in coding sequences, which can reflect selection on translational efficiency or genome composition.

References

1. Phylogenetics of the Borage Family: Delimiting Boraginales and Assessing Closest Relatives. Aliso (2017).
2. Comparison of Boraginales Plastomes: Insights into Codon Usage Bias, Adaptive Evolution, and Phylogenetic Relationships. Diversity (2022).
3. Molecular phylogenetics of Euploca (Boraginaceae): homoplasy in many characters, including the C4 photosynthetic pathway. Botanical Journal of the Linnean Society (2022).