Realignment of Calystegia and Convolvulus (Convolvulaceae)

Lewis, Walter H.; Oliver, Royce L.

doi:10.2307/2394871

Cited by 25 publications

(15 citation statements)

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“…Palinologicamente, Convolvulaceae é considerada euripolínica, apresentando grande variabilidade de caracteres polínicos, principalmente quanto ao tipo apertural e à ornamentação da exina (Erdtman 1952, Sengupta 1972, permitindo assim a utilização de tais caracteres para o reconhecimento dos táxons (Hallier 1893, Lewis & Oliver 1965, Ferguson et al 1977, Melhem & Corrêa 1987, Tellería & Daners 2003.…”

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Morfologia polínica de espécies das tribos Ipomoeeae Hallier f. e Merremieae D.F. Austin (Convolvulaceae) ocorrentes numa região de ecótono do município de Caetité, BA, Brasil

Vasconcelos

Saba

Junqueira

et al. 2015

Hoehnea

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-(Pollen morphology of species from tribes Ipomoeeae Hallier f. and Merremieae D.F. Austin, Convolvulaceae, occurring in an ecotonal region of the municipality of Caetité, Bahia State, Brazil). This pollen morphology study of species of the tribes Ipomoeeae and Merremieae (Convolvulaceae) aims to contribute to the knowledge of palynology of the taxa studied and to the taxonomy of the group. Ten species of Ipomoea, one of Turbina (Ipomoeeae tribe), and four species of Merremia (Merremieae tribe) occurring in the flora of the Brejinho das Ametistas, Caetité, Bahia State, Brazil were examined. The pollen grains were acetolysed, measured, described, and illustrated under light microscopy (LM) and scanning electron (SEM) microscopy. By analyzing the pollen morphology of the taxa studied, it was possible to confirm the euripollinic character of the group and to recognize two pollen types based upon the apertural type and the exine ornamentation: 1) pantoporate, echinate pollen grain; 2) 3-6-colpate, microechinate, granulate pollen grain.

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“…Além destes, outros autores estudaram a morfologia polínica da família Convolvulaceae: Laguardia (1961), Lewis & Oliver (1965), Vij & Sachdeva (1974), Melhem & Corrêa (1987), Machado & Melhem (1987), Araújo et al (2000), Leite et al (2005) e Vital et al (2008).…”

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Morfologia polínica de espécies das tribos Ipomoeeae Hallier f. e Merremieae D.F. Austin (Convolvulaceae) ocorrentes numa região de ecótono do município de Caetité, BA, Brasil

Vasconcelos

Saba

Junqueira

et al. 2015

Hoehnea

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“…The genera of Convolvulaceae were separated by O'Donell (1959) according to Hallier's aperture distinction, but at the same time he stated that pollen grains of the genus Convolvulus have the 3-colporate pollen type. Lewis and Oliver (1965) reported results that supported the findings of Hallier (1893), but not those of O'Donell (1959). Sengupta (1972) reported an exhaustive palynological investigation on the Convolvulaceae based on the number and dispersion of apertures.…”

Section: Mehmet Tekin and Gulden Yilmazmentioning

confidence: 60%

Palynological Studies of the Genus <em>Convolvulus</em> L. (Convolvulaceae) from Turkey

Tekin

Yılmaz

2016

Bot. Sci.

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Pollen morphology of six taxa of the genus Convolvulus (Convolvulus assyricus , C. betonicifolius subsp. betonicifolius, C. cataonicus, C. galaticus, C. lineatus, and C. pseudoscammonia) were investigated. Three of these taxa, C. assyricus, C. cataonicus and C. pseudoscammonia, are endemic to Turkey. Pollen grains were evaluated mainly for four diagnostic characteristics: pollen type, pollen shape, apertures and ornamentation. Following the measurements and observations, pollen grains were photographed under an optical and a scanning electron microscope. The pollen grains of the examined taxa are all 3-zonocolpate. The pollen shape is oblate, suboblate, oblate spheroidal or prolate spheroidal. The nexine is thinner than the sexine or equal, and the tectum is microechinate and rarely or densely perforated in all species except C. pseudoscammonia. Colpus borders and tapering ends are distinct and the colpus area is gemmate and granulate in all examined species. Key words: Convolvulus, Convolvulaceae, pollen morphology, Turkey Estudios palinológicos del género Convolvulus L. (Convolvulaceae) de Turquía ResumenSe estudió la morfología del polen de seis especies del género Convolvulus (Convolvulus assyricus, C. betonicifolius subsp. betonicifolius, C. cataonicus, C. galaticus, C. lineatus y C. pseudoscammonia). Tres de estos taxones, C. assyricus, C. cataonicus y C. pseudoscammonia, son endémicos de Turquía. Se evaluaron principalmente cuatro características diagnósticas del polen: tipo de polen, forma del polen, aperturas y ornamentaciones. Después de hacer estas mediciones y observaciones, se tomaron fotos bajo el microscopio óptico y los granos se escanearon con microscopio electrónico de barrido. Los granos de polen de los grupos examinados son todos trizonocolpados. Por su forma, el polen es oblato, suboblato, esferoide oblato o esferoide prolato . La nexina es igual o más delgada que la sexina y el tectum es microequinado y rara o densamente perforado en todas las especies excepto en C. pseudoscammonia. Los bordes del colpo y las terminaciones atenuadas son distintivos, y el área del colpo es gemada y granulada en todas las especies examinadas. Palabras clave: Convolvulus, Convolvulaceae, morgfología del polen, Turquía. Botanical Sciences

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“…Although molecular phylogenetic data indicate that Calystegia is a monophyletic group nested within a paraphyletic Convolvulus L. (Stefanovic, Krueger & Olmstead, 2002; Carine et al. , 2004), the two genera are readily distinguished by a suite of morphological characters, notably: (1) the bracteoles that are large and either fully or partially cover the calyx in Calystegia (except in a few Californian taxa), but are small and remote in Convolvulus , (2) the stigmas that are swollen in Calystegia , but filiform in Convolvulus , (3) the ovary that is unilocular in Calystegia and two‐celled in Convolvulus , (4) the corolla that is glabrous in Calystegia , but pubescent down the mid‐petaline bands in Convolvulus and (5) the pollen grains that are polypantoporate in Calystegia and trizonocolpate in Convolvulus (Brummitt, 1963; Lewis & Oliver, 1965; Morley, 1974; Moore, Webb & Collinson, 1991).…”

Section: Introductionmentioning

confidence: 99%

Disentangling the bindweeds: hybridization and taxonomic diversity in BritishCalystegia(Convolvulaceae)

Brown

Brummitt

Spencer

et al. 2009

Botanical Journal of the Linnean Society

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Calystegia is taxonomically complex. More than 65 taxa are currently recognized, but species circumscription is problematic, geographical intergradation between taxa is common and hybridization between species is known to occur. In this study, the nuclear ribosomal internal transcribed spacer 1 region (ITS1) was used to investigate the extent to which interspecific hybridization has contributed to the generation of taxonomic diversity in the C. sepium complex of the genus. Focusing principally on taxa that occur in Britain and their putative relatives, patterns of infra-individual ITS1 variation were examined by direct sequencing and cloning. Direct sequencing of the ITS region of 58 accessions representing 11 taxa and one hybrid revealed 22 variable positions that collectively defined 14 ribotypes. Diagnostic and invariant ribotypes lacking polymorphisms were found in C. sepium ssp. sepium, C. sepium ssp. limnophila, C. silvatica ssp. silvatica, C. pellita, C. pubescens and C. soldanella. Three ribotypes were recovered in C. sepium ssp. americana, two of which lacked polymorphisms, whereas the third exhibited two polymorphic sites. Calystegia sepium ssp. roseata, C. sepium ssp. spectabilis, C. silvatica ssp. disjuncta, C. pulchra and C. ¥ howittiorum were each characterized by taxon-specific polymorphisms in the ITS1 region. In each case, the polymorphisms observed were consistent with the co-occurrence in the genome of nonpolymorphic ribotypes that were observed in other taxa. This observation is supported by cloning of the ITS region and is consistent with a hybrid origin for the taxa in which they occur. The hypotheses of hybridity proposed are further shown to be congruent with other data, notably morphology. This study suggests that taxonomic diversity within the C. sepium

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Realignment of Calystegia and Convolvulus (Convolvulaceae)

Cited by 25 publications

References 0 publications

Morfologia polínica de espécies das tribos Ipomoeeae Hallier f. e Merremieae D.F. Austin (Convolvulaceae) ocorrentes numa região de ecótono do município de Caetité, BA, Brasil

Morfologia polínica de espécies das tribos Ipomoeeae Hallier f. e Merremieae D.F. Austin (Convolvulaceae) ocorrentes numa região de ecótono do município de Caetité, BA, Brasil

Palynological Studies of the Genus <em>Convolvulus</em> L. (Convolvulaceae) from Turkey

Disentangling the bindweeds: hybridization and taxonomic diversity in BritishCalystegia(Convolvulaceae)

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