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<p>The present study investigates the taxonomic identity of&#xa0;<i>Origanum vulgare</i> populations in southern Italy using an integrated morphometric and molecular approach. Currently, three subspecies of&#xa0;<i>O. vulgare</i>&#xa0;are recognized in Italy, of which only <i>O.</i> subsp.&#xa0;<i>viridulum</i>&#xa0;was previously known to occur in Apulia. However, floristic surveys conducted along the Ionian sector of the Salento peninsula (southern Apulia) led to the identification of populations whose morphometric traits differ significantly from the reference populations of <i>O.</i> subsp.&#xa0;<i>viridulum</i>&#xa0;found on the Adriatic coast of the same region. Molecular analyses, based on the&#xa0;<i>trn</i>H<i>–psb</i>A&#xa0;chloroplast intergenic spacer, corroborated the morphological evidence, unequivocally identifying the Ionian populations as&#xa0;<i>O. vulgare</i>&#xa0;subsp.&#xa0;<i>hirtum</i>. This East Mediterranean taxon had never been previously recorded within the Italian national territory. This finding represents the first record of&#xa0;<i>O. vulgare</i>&#xa0;subsp.&#xa0;<i>hirtum</i>&#xa0;for the Italian flora, extending the known distribution range of the subspecies westward into the Central Mediterranean. The results highlight the importance of integrative approaches in resolving the taxonomic complexities within the&#xa0;<i>O. vulgare</i>&#xa0;group and provide new insights into the biogeographical relationships between the Italian and Balkan-Ionian floras.</p>

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Origanum vulgare subsp. hirtum (Lamiaceae) in Italy: Molecular and morphological evidence for the first record

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Quintino Giovanni Manni,
  • Roberto Gennaio,
  • Giuseppe Pellegrino

摘要

The present study investigates the taxonomic identity of Origanum vulgare populations in southern Italy using an integrated morphometric and molecular approach. Currently, three subspecies of O. vulgare are recognized in Italy, of which only O. subsp. viridulum was previously known to occur in Apulia. However, floristic surveys conducted along the Ionian sector of the Salento peninsula (southern Apulia) led to the identification of populations whose morphometric traits differ significantly from the reference populations of O. subsp. viridulum found on the Adriatic coast of the same region. Molecular analyses, based on the trnH–psbA chloroplast intergenic spacer, corroborated the morphological evidence, unequivocally identifying the Ionian populations as O. vulgare subsp. hirtum. This East Mediterranean taxon had never been previously recorded within the Italian national territory. This finding represents the first record of O. vulgare subsp. hirtum for the Italian flora, extending the known distribution range of the subspecies westward into the Central Mediterranean. The results highlight the importance of integrative approaches in resolving the taxonomic complexities within the O. vulgare group and provide new insights into the biogeographical relationships between the Italian and Balkan-Ionian floras.