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<p><i>Allium</i> section <i>Codonoprasum</i> comprises a diverse group of evolutionarily young taxa with unclear taxonomic boundaries. Despite several recent taxonomic studies clarifying the identity of <i>A. fuscum</i>—a species previously considered a widespread representative of the <i>A. paniculatum</i> complex, characterised by a yellowish-green perigon tinged with brown and purple—there is still a tendency to assign similar-looking plants to this species based solely on the colour of the perigon. We collected several population samples whose specimens resembled both <i>A. fuscum</i> and the recently described <i>A. orestis</i> in some characters. Using an integrated biosystematic approach, we revealed that these specimens represent a new species, <i>Allium nebulosum.</i> Accessions of the new species formed a homogeneous group that was clearly distinct from <i>A. fuscum</i> and <i>A. orestis</i> in multivariate genetic and morphometric analyses<i>.</i> This new species is an early-summer-flowering polyploid species consisting of tri- and tetraploids. It inhabits open and semi-shaded rocky outcrops, dry grasslands, semi-dry shrublands and various types of woodland, ranging from <i>Platanus</i> floodplain forests to dry oak woodlands. It is distributed across the northern and eastern Balkans. It is not closely related to members of the <i>A. paniculatum</i> complex, including <i>A. fuscum</i>, but forms a strongly supported sister clade to the <i>A. flavum</i> aggregate clade in the nuclear ribosomal internal transcribed spacer tree. A detailed description, distribution map and conservation status are also provided for this species. Additionally, the transverse shape of the leaf and the epidermal micromorphological characteristics of <i>A. orestis</i> are presented for the first time.</p>

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The illusion of sameness: uncovering Allium nebulosum, a new species of Allium sect. Codonoprasum from the Northern and Eastern Balkans through an integrated taxonomic approach

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Martin Duchoslav,
  • Lucie Kobrlová,
  • Kateřina Vojtěchová,
  • Miloslav Kitner

摘要

Allium section Codonoprasum comprises a diverse group of evolutionarily young taxa with unclear taxonomic boundaries. Despite several recent taxonomic studies clarifying the identity of A. fuscum—a species previously considered a widespread representative of the A. paniculatum complex, characterised by a yellowish-green perigon tinged with brown and purple—there is still a tendency to assign similar-looking plants to this species based solely on the colour of the perigon. We collected several population samples whose specimens resembled both A. fuscum and the recently described A. orestis in some characters. Using an integrated biosystematic approach, we revealed that these specimens represent a new species, Allium nebulosum. Accessions of the new species formed a homogeneous group that was clearly distinct from A. fuscum and A. orestis in multivariate genetic and morphometric analyses. This new species is an early-summer-flowering polyploid species consisting of tri- and tetraploids. It inhabits open and semi-shaded rocky outcrops, dry grasslands, semi-dry shrublands and various types of woodland, ranging from Platanus floodplain forests to dry oak woodlands. It is distributed across the northern and eastern Balkans. It is not closely related to members of the A. paniculatum complex, including A. fuscum, but forms a strongly supported sister clade to the A. flavum aggregate clade in the nuclear ribosomal internal transcribed spacer tree. A detailed description, distribution map and conservation status are also provided for this species. Additionally, the transverse shape of the leaf and the epidermal micromorphological characteristics of A. orestis are presented for the first time.