Stellaria ruderalis, a new species in the Stellaria media group from central Europe / LEPSI M. / 2019

in 91 - 2019 - 91-Preslia-2019 (Bulletin de Preslia) Titre : Stellaria ruderalis, a new species in the Stellaria media group from central Europe Type de document : texte imprimé Auteurs : LEPSI M., Auteur ; Petr LEPSI P., Auteur ; Petr KOUTECKY P., Auteur ; Magdalena LUCANOVA M., Auteur ; Eva KOUTECKA E., Auteur ; Zdenek KAPLAN Z., Auteur Année de publication : 2019 Importance : 391-420 Langues : Anglais (eng) Catégories : EUROPE STELLARIA MEDIA STELLARIA RUDERALIS Mots-clés : Caryophyllaceae, flow cytometry, internal transcribed spacer (ITS) sequencing, karyology, multivariate morphometrics, Stellaria media agg., taxonomy Résumé : A new allotetraploid species in the Stellaria media group, S. ruderalis M. Lepší, P. Lepší, Z. Kaplan & P. Koutecký, which is possibly of hybridogenous origin between S. pallida and S. neglecta, is distin-guished and described based on a biosystematic revision of the S. media group. A suite of bio-systematic techniques, including molecular (internal transcribed spacer sequencing), karyological (chromosome counting, flow cytometry), multivariate morphometrics and phenological observations, was used to assess the variation in this species group and determine the taxonomic status of the spe-cies. All the methods employed produced similar results and supported the delimitation of four spe-cies within the Stellaria media group in central Europe: Stellaria ruderalis (2n = 4x = 44), S. pallida (2n = 2x = 22), S. neglecta (2n = 2x = 22) and S. media s. str. (2n = 4x = 40). Stellaria ruderalis is a winter annual growing mainly in disturbed ruderal open or semi-open communities. This species’ broad ecological amplitude allows it to commonly co-occur with its three related species. It is proba-bly a widespread species in southern and central Europe. It is currently spreading in the northern part of central Europe. Photographs of the type specimen and individuals of the new species in situ are pre-sented. Scanning electron micrographs of seeds, microphotographs of seeds and mitotic chromosome spreads and a key for the identification of all four species are provided. Saisie BD Flore : Rien à saisir Citation bibliographique : LEPSI M., LEPSI P., KOUTECKY P., LUCANOVA M., KOUTECKA E. & KAPLAN Z., 2019. - Stellaria ruderalis, a new species in the Stellaria media group from central Europe. Preslia, 91: 391-420.

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