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Systematics of Vallisneria (Hydrocharitaceae)

Morphology, species delimitation, and interspecific relationships were evaluated in a phylogenetic context in the aquatic monocotyledon genus Vallisneria using a combination of morphological and molecular (nrITS, rbcL, trnK 5′ intron) data. Contrary to previous studies that recognized few species wo... Full description

Journal Title: Systematic botany 2008-01, Vol.33 (1), p.49-65
Main Author: Les, Donald H
Other Authors: Jacobs, Surrey W. L , Tippery, Nicholas P , Chen, Lei , Moody, Michael L , Wilstermann-Hildebrand, Maike
Format: Electronic Article Electronic Article
Language: English
Subjects:
s
Quelle: Alma/SFX Local Collection
Publisher: The American Society of Plant Taxonomists, Inc
ID: ISSN: 0363-6445
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title: Systematics of Vallisneria (Hydrocharitaceae)
format: Article
creator:
  • Les, Donald H
  • Jacobs, Surrey W. L
  • Tippery, Nicholas P
  • Chen, Lei
  • Moody, Michael L
  • Wilstermann-Hildebrand, Maike
subjects:
  • Anthers
  • BAYESIAN ANALYSIS
  • Biological taxonomies
  • Botany
  • CHLOROPLAST DNA
  • Flower stigma
  • Identification and classification
  • Introns
  • Leaves
  • MAIDENIA
  • NECHAMANDRA
  • Nomenclature
  • NUCLEAR RIBOSOMAL DNA
  • PHYLOGENETICS
  • Plant morphology
  • Plants
  • s
  • Taxa
  • We they distinction
ispartof: Systematic botany, 2008-01, Vol.33 (1), p.49-65
description: Morphology, species delimitation, and interspecific relationships were evaluated in a phylogenetic context in the aquatic monocotyledon genus Vallisneria using a combination of morphological and molecular (nrITS, rbcL, trnK 5′ intron) data. Contrary to previous studies that recognized few species worldwide, we distinguished 12 species by molecular data, and an additional 2–3 species by morphological differences within groups that were invariant at the molecular level. Two new Vallisneria species (V. australis, V. erecta) are formally described. Other potentially novel species were detected from the cultivated material examined but require further study to elucidate their taxonomic status. Phylogenetic analyses indicated that vittate (caulescent) species (including Maidenia rubra) are not basal, but nested between two groups of rosulate (rosette) species. To preserve Vallisneria as monophyletic, a new combination is made (V. rubra) that accommodates the transfer of M. rubra to Vallisneria. Several taxonomic characters associated with the stigma morphology of pistillate flowers were found to represent suites of features related to pollination. In most cases, these character suites corresponded to a particular arrangement of filaments in the staminate flowers. The precise geographical origin of Vallisneria remains difficult to determine. However, we conclusively documented the presence of the Old World V. spiralis in Texas (United States), which constitutes the first authentic record of this nonindigenous species in North America.
language: eng
source: Alma/SFX Local Collection
identifier: ISSN: 0363-6445
fulltext: fulltext
issn:
  • 0363-6445
  • 1548-2324
url: Link


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descriptionMorphology, species delimitation, and interspecific relationships were evaluated in a phylogenetic context in the aquatic monocotyledon genus Vallisneria using a combination of morphological and molecular (nrITS, rbcL, trnK 5′ intron) data. Contrary to previous studies that recognized few species worldwide, we distinguished 12 species by molecular data, and an additional 2–3 species by morphological differences within groups that were invariant at the molecular level. Two new Vallisneria species (V. australis, V. erecta) are formally described. Other potentially novel species were detected from the cultivated material examined but require further study to elucidate their taxonomic status. Phylogenetic analyses indicated that vittate (caulescent) species (including Maidenia rubra) are not basal, but nested between two groups of rosulate (rosette) species. To preserve Vallisneria as monophyletic, a new combination is made (V. rubra) that accommodates the transfer of M. rubra to Vallisneria. Several taxonomic characters associated with the stigma morphology of pistillate flowers were found to represent suites of features related to pollination. In most cases, these character suites corresponded to a particular arrangement of filaments in the staminate flowers. The precise geographical origin of Vallisneria remains difficult to determine. However, we conclusively documented the presence of the Old World V. spiralis in Texas (United States), which constitutes the first authentic record of this nonindigenous species in North America.
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subjectAnthers ; BAYESIAN ANALYSIS ; Biological taxonomies ; Botany ; CHLOROPLAST DNA ; Flower stigma ; Identification and classification ; Introns ; Leaves ; MAIDENIA ; NECHAMANDRA ; Nomenclature ; NUCLEAR RIBOSOMAL DNA ; PHYLOGENETICS ; Plant morphology ; Plants ; s ; Taxa ; We they distinction
ispartofSystematic botany, 2008-01, Vol.33 (1), p.49-65
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abstractMorphology, species delimitation, and interspecific relationships were evaluated in a phylogenetic context in the aquatic monocotyledon genus Vallisneria using a combination of morphological and molecular (nrITS, rbcL, trnK 5′ intron) data. Contrary to previous studies that recognized few species worldwide, we distinguished 12 species by molecular data, and an additional 2–3 species by morphological differences within groups that were invariant at the molecular level. Two new Vallisneria species (V. australis, V. erecta) are formally described. Other potentially novel species were detected from the cultivated material examined but require further study to elucidate their taxonomic status. Phylogenetic analyses indicated that vittate (caulescent) species (including Maidenia rubra) are not basal, but nested between two groups of rosulate (rosette) species. To preserve Vallisneria as monophyletic, a new combination is made (V. rubra) that accommodates the transfer of M. rubra to Vallisneria. Several taxonomic characters associated with the stigma morphology of pistillate flowers were found to represent suites of features related to pollination. In most cases, these character suites corresponded to a particular arrangement of filaments in the staminate flowers. The precise geographical origin of Vallisneria remains difficult to determine. However, we conclusively documented the presence of the Old World V. spiralis in Texas (United States), which constitutes the first authentic record of this nonindigenous species in North America.
pubThe American Society of Plant Taxonomists, Inc
doi10.1600/036364408783887483
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