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Typification of eight current and seven related names and a new section in the genus Bromus (Bromeae, Pooideae, Poaceae).

ABSTRACT: During our nomenclatural revision of the genus Bromus L. (Poaceae) for Flora Iberica, we found that several names were still untypified: nine names in current use or their basionyms and five synonyms. Typifications are still needed since stabilising the names will facilitate their use. We propose lectotypes for Bromusalopecuros Poir., B.contortus Desf. (and the superfluous B.alopecuroides Poir.), B.benekenii (Lange) Trimen, B.intermediusGuss.subsp.divaricatus Bonnier & Layens, B.molliformis J.Lloyd ex Billot, B.lepidus Holmb., B.lepidus f. lasiolepis Holmb., Bromussubg.Stenobromus (Griseb.) Hack. and Bromussect.Stenobromus Griseb. Neotypes for B.erectus Huds. and B.ramosus Huds. and an epitype for B.intermediussubsp.divaricatus Bonnier & Layens are proposed. In addition, we identify an isoneotype for B.erectus and isolectotypes for B.lepidus and B.lepidusf.lasiolepis. The area inhabited by the typified taxa includes both Africa and Europe. All the selected types are in agreement with the current use of the names and, thus, our selections contribute to stabilising the nomenclature of the genus Bromus. A discussion is provided to justify the selections. In addition, we typified two supraspecific names B.subg.Stenobromus and B.sect.Stenobromus. Finally, a new section, B.sect.Penicillius Llamas & Acedo, is described.

SUBMITTER: Llamas F

PROVIDER: S-EPMC6509104 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Typification of eight current and seven related names and a new section in the genus Bromus (Bromeae, Pooideae, Poaceae).

Llamas Félix F Acedo Carmen C

PhytoKeys 20190502

During our nomenclatural revision of the genus Bromus L. (Poaceae) for Flora Iberica, we found that several names were still untypified: nine names in current use or their basionyms and five synonyms. Typifications are still needed since stabilising the names will facilitate their use. We propose lectotypes for Bromusalopecuros Poir., B.contortus Desf. (and the superfluous B.alopecuroides Poir.), B.benekenii (Lange) Trimen, B.intermediusGuss.subsp.divaricatus B ...[more]

PMID: 31118872

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Project description:To investigate phylogenetic relationships among and within major lineages of Bromus, with focus on Bromus sect. Bromus, we analyzed DNA sequences from two nuclear ribosomal (ITS, ETS) and two plastid (rpl32-trnLUAG , matK) regions. We sampled 103 ingroup accessions representing 26 taxa of B. section Bromus and 15 species of other Bromus sections. Our analyses confirm the monophyly of Bromus s.l. and identify incongruence between nuclear ribosomal and plastid data partitions for relationships within and among major Bromus lineages. Results support classification of B. pumilio and B. gracillimus within B. sect. Boissiera and B. sect. Nevskiella, respectively. These species are sister groups and are closely related to B. densus (B. sect. Mexibromus) in nrDNA trees and Bromus sect. Ceratochloa in plastid trees. Bromus sect. Bromopsis is paraphyletic. In nrDNA trees, species of Bromus sects. Bromopsis, Ceratochloa, Neobromus, and Genea plus B. rechingeri of B. sect. Bromus form a clade, in which B. tomentellus is sister to a B. sect. Genea-B. rechingeri clade. In the plastid trees, by contrast, B. sect. Bromopsis species except B. tomentosus form a clade, and B. tomentosus is sister to a clade comprising B. sect. Bromus and B. sect. Genea species. Affinities of B. gedrosianus, B. pulchellus, and B. rechingeri (members of the B. pectinatus complex), as well as B. oxyodon and B. sewerzowii, are discordant between nrDNA and plastid trees. We infer these species may have obtained their plastomes via chloroplast capture from species of B. sect. Bromus and B. sect. Genea. Within B. sect. Bromus, B. alopecuros subsp. caroli-henrici, a clade comprising B. hordeaceus and B. interruptus, and B. scoparius are successive sister groups to the rest of the section in the nrDNA phylogeny. Most relationships among the remaining species of B. sect. Bromus are unresolved in the nrDNA and plastid trees. Given these results, we infer that most B. sect. Bromus species likely diversified relatively recently. None of the subdivisional taxa proposed for Bromus sect. Bromus over the last century correspond to natural groups identified in our phylogenetic analyses except for a group including B. hordeaceus and B. interruptus.

Dataset Information

Typification of eight current and seven related names and a new section in the genus Bromus (Bromeae, Pooideae, Poaceae).

Publications

Typification of eight current and seven related names and a new section in the genus <i>Bromus</i> (Bromeae, Pooideae, Poaceae).

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