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Auteur Marcel Westenberg |
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Affiner la recherchePennisetum setaceum or Pennisetum advena cultivars, what ornamental do we have in our garden / Johannes Leonardus Cornelis Hendrikus van Valkenburg in Ecology and evolution, 11 (2021)
Titre : Pennisetum setaceum or Pennisetum advena cultivars, what ornamental do we have in our garden Type de document : Imprimé Auteurs : Johannes Leonardus Cornelis Hendrikus van Valkenburg (1964) ; Maarten Costerus ; Marcel Westenberg Année de publication : 2021 Article en page(s) : 11216-11222 Langues : Anglais (eng) Mots-clés : Cenchrus Pennisetum setaceum (Forssk.) Chiov., 1923 Pennisetum advena Résumé : Pennisetum Rich. or following recent taxonomic insights Cenchrus L. is a genus with some 120 species worldwide, especially in warm areas. The genus includes some crops, some ornamentals but mostly species that are considered weedy. The name of one of the weedy species Pennisetum setaceum (Forssk.) Chiov. is also found on labels of ornamental grasses as P. setaceum “Rubrum.” It has been debated to belong to a species on its own Pennisetum advena Wipff & Veldkamp or Cenchrus advena (Wipff & Veldkamp) Morrone, only known from cultivation, whereas others still adhere to a broader species concept of P. setaceum. The recent inclusion of P. setaceum on the EU List of Union concern has revitalized the discussion on this issue for commercial reasons. Based on a morphological and molecular comparison (ITS, rbcL, and the trnh-psbA intergenic spacer sequences) of the type specimen of P. advena, five of its “cultivars” in trade and collections of P. setaceum from different regions of the world we conclude that plants currently in trade in Western Europe belong to a separate species P. advena. A drooping inflorescence is consistent as is the difference in width of the leaf blade, the leaf blade being flat or involute, the central vein being swollen or not, and the length of the stipe being 0.3–1.1 mm in P. advena and 1.1–3.1 mm in P. setaceum. On the chloroplast markers rbcL and trnH-psbA, the species consistently differ in 2 and 4 base pairs, respectively. On the nuclear ITS sequence, there is only 90% overlap between the two species. This justifies these ornamentals to be
excluded from the List of Union concern of EU regulation 1143/2014.Lien pérenne : DOI : 10.1002/ece3.7908 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=146667
in Ecology and evolution > 11 (2021) . - 11216-11222Valkenburg, Johannes Leonardus Cornelis Hendrikus van (1964), Costerus, Maarten, Westenberg, Marcel 2021 Pennisetum setaceum or Pennisetum advena cultivars, what ornamental do we have in our garden. Ecology and evolution, 11: 11216-11222.Documents numériques
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Titre : The large Gunnera’s (G. tinctoria and G. manicata) in Europe in relation to EU regulation 1143/2014 Type de document : Imprimé Auteurs : Johannes Leonardus Cornelis Hendrikus van Valkenburg (1964) ; Bruce A. Osborne ; Marcel Westenberg Année de publication : 2023 Article en page(s) : e0284665 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes Résumé : Incorrect labelling of plants in the horticultural trade and misidentification is widespread. For the inspection services of the EU member states, correct identification of G. tinctoria has become important since the species was added to the List of Union concern in accordance with EU regulation 1143/2014 in August 2017. In the horticultural trade Gunnera plants are generally of modest dimensions and rarely flowering, so that the major distinguishing morphological characters for the identification of the two large species, G. tinctoria and G. manicata, are missing. As G. tinctoria is included in the EU regulation, its trade is prohibited, although the closely related species, G. manicata is not included on the list. Given that it is often difficult to distinguish between these two large herbaceous species using morphological attributes we used standard chloroplast DNA barcode markers, supplemented at a later stage by ITS markers. Plant material of putative G. tinctoria or G. manicata was obtained from the native and introduced range, both from “wild” sources, botanical gardens, and the horticultural trade. In western Europe plants circulating in the horticultural trade turned out to be predominantly G. tinctoria, with only one plant in cultivation identified as true G. manicata and the G. manicata found in botanical gardens was a hybrid recently described as G. x cryptica. Lien pérenne : DOI : 10.1371/journal.pone.0284665 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=151697
in PloS ONE > 18 (4) (2023) . - e0284665Valkenburg, Johannes Leonardus Cornelis Hendrikus van (1964), Osborne, Bruce A., Westenberg, Marcel 2023 The large Gunnera’s (G. tinctoria and G. manicata) in Europe in relation to EU regulation 1143/2014. PloS ONE, 18(4): e0284665.Documents numériques
Article (2023)URL
