Abstract
<em>Laserpitium pseudomeum</em> is an endemic umbellifer of Greece occurring in the mountains of Sterea Ellas and northern Peloponnese. Molecular data indicate that it is not related to its putative congeners, but instead constitutes an isolated lineage. The nuclear ribosomal DNA ITS tree places it as a weakly supported sister group to <em>Portenschlagiella ramosissima</em>, the sole species in its genus, whereas the tree inferred from three noncoding cpDNA loci does not confirm this relationship. <em>Portenschlagiella ramosissima</em> is sometimes placed in <em>Athamanta</em>, an affinity supported neither by molecular data nor by fruit morphology. <em>Laserpitium pseudomeum</em> notably differs from <em>P. ramosissima</em> in vegetative, flower, and fruit characteristics, and no obvious morphological synapomorphies indicate their close relationship. Therefore, we place <em>L. pseudomeum</em> in the newly described genus <em>Laserocarpum</em> and lectotypify the species with the specimen <em>Orphanides 2019</em> (G00766460) at G-Boiss.
Highlights
Laserpitium L., a genus of the angiosperm family Apiaceae, is distributed in western Eurasia and encompasses approximately 20–22(–35) species in its traditional circumscription [1,2,3]
To infer the phylogenetic placements of L. pseudomeum and P. ramosissima, we used molecular data from a previous taxonomically comprehensive study of Daucinae [7] deposited in TreeBASE (No S18012), which was based on analyses of ITS and plastid rps16 intron, rpoC1 intron, and rpoB-trnC intergenic spacer sequence variation
In the maximum likelihood (ML) tree inferred from ITS data, L. pseudomeum and P. ramosissima were placed together, but with a low bootstrap support of 55% (Fig. 1)
Summary
Laserpitium L., a genus of the angiosperm family Apiaceae, is distributed in western Eurasia and encompasses approximately 20–22(–35) species in its traditional circumscription [1,2,3]. Based on molecular phylogenetic studies, the genus is placed in tribe Scandiceae, subtribe Daucinae [4]. A distinctive feature of Daucinae is the presence of fruits with secondary (vallecular) ribs that are spiny (as in Daucus L. and Orlaya Hoffm.) or winged (as in Laserpitium). All species traditionally placed in Laserpitium sensu lato Molecular phylogenetic studies have shown that the traditional delineation of winged-fruited genera of Daucinae was artificial [6,7]. Only six species were retained in Laserpitium sensu stricto Laserpitium pseudomeum Orph., Heldr. & Sartori ex Boiss., which in some molecular analyses constituted an isolated lineage close to Laser [7]
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