A geo-historical perspective on the distribution and variation in Senecio s.l. (Asteraceae, Senecioneae) in Mexico and C. America

Barkley, T. M.

doi:10.1007/978-3-7091-6928-5_7

Cited by 3 publications

(8 citation statements)

References 12 publications

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“…The results of the present study support the recognition of two species but also Barkley's (1962) contention that Senecio indecorus and S. paucijlorus are "not always easily separable in the herbarium". It is clear from the results of the PCA that distinction between the two taxa is not always clear.…”

Section: Discussionsupporting

confidence: 88%

“…The fact that discoid individuals are not uncommon in S. cymbalaria (Femald 1924;Whitton & Bain 1992) lends some support to this hypothesis. The mesic boreal and montane habitats where S. indecorus is common are shared by S. pauperculus and S. pseudaureus and this may indicate a relationship among these taxa, as has been suggested by Barkley (1962) for S. pseudaureus. A more precise determination of the relationship between these two species is thus important to the understanding of the aureoid complex as a whole.…”

Section: Introductionmentioning

confidence: 59%

“…The complex has been recognized as a distinct genus, Packera E v e and Love, by numerous authors (Love & Love 1976;Weber & Liive 1981;Jeffrey 1992). As a result of numerous recent studies (Barkley 1962(Barkley , 1978(Barkley , 1988(Barkley , 1990Kowal 1975;Bain 1985Bain , 1988Bain & Denford 1985;Whitton & Bain 1992) hypotheses have been generated in efforts to understand evolution within the group and to explain why the species are so poorly defined. In a comprehensive review of the aureoid group Barkley (1988) suggests that evolution within the group was largely influenced by climatic change in North America during the Tertiary which has resulted in plant migrations, range overlap of taxa and resulting hybridization and introgression.…”

Section: Introductionmentioning

confidence: 99%

“…Munz ( In more recent revisionary work involving the two taxa, both have been recognized as distinct species. Barkley (1962) provides a detailed account stating that the two taxa are closely related and, on the basis of herbarium studies, might be treated as varieties of the same species. He bases his separation then on their ecological distinctiveness and on differences more apparent in the field allowing that "subsequent data may make it necessary to modify this interpretation".…”

Section: Introductionmentioning

confidence: 99%

“…He bases his separation then on their ecological distinctiveness and on differences more apparent in the field allowing that "subsequent data may make it necessary to modify this interpretation". In a more recent treatment (Barkley 1978) he maintains the two as distinct species.…”

Section: Introductionmentioning

confidence: 99%

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Taxonomìc analysis of Senecio pauciflorus and S. indecorus (Asteraceae)

Bain

Whitton

1994

Nordic Journal of Botany

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Taxonomic analysis of Senecio pauciflorus and S.indecorus (Asteraceae). -Nord. J. . Copenhagen. ISSN 0107-055X.Senecio paucflorus and S. indecorus (= Packera pauciflora and I? indecora) are autogamous, high polyploid species with similar geographic ranges in North America. Their east-west distribution pattern including a disjunction in California is unusual within the aureoid Senecio complex and may provide insights into the origins of the aureoid complex. Taxonomic treatment of the two taxa has varied in the past due to the similarity and variability of the taxa. Results of morphological analyses of 192 herbarium specimens show that the taxa are best treated as two distinct species and that infraspecific variation is not related to geographical distribution. Separation of taxa remains difficult. California specimens are the most difficult to classify and may represent the ancestral group. Based on morphology and chromosome number it is suggested that the S. pauciflorus-S. indecorus group may have originated from the arctic-alpine aureoid group including S. cymbalaria.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Taxonomìc analysis of Senecio pauciflorus and S. indecorus (Asteraceae)

Bain

Whitton

1994

Nordic Journal of Botany

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Secondary Metabolites from Mexican Species of the Tribe Senecioneae (Asteraceae)

et al. 2020

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Abstract. A revision of the Mexican species belonging to the tribe Senecioneae chemically studied so far, shows that the genera Senecio and Packera (subtribe Senecioninae), and the genera Barkleyanthus, Pittocaulon, Psacalium, and Telanthophora (subtribe Tussilagininae) contain pyrrolizidine alkaloids (PAs) and eremophilane derivatives as their main secondary metabolites. However, from Roldana and Robinsonecio (subtribe Tussilagininae) no PAs have been isolated. A special case is the genus Pseudogynoxys in which neither PAs nor eremophilanes are reported. Resumen. Una revisión de las especies mexicanas de la tribu Senecioneae estudiadas químicamente hasta el momento, muestra que los géneros Senecio y Packera (subtribu Senecioninae), y los géneros Barkleyanthus, Pittocaulon, Psacalium y Telanthophora (subtribu Tussilagininae) contienen alcaloides pirrolizidínicos (APs) y derivados de eremofilano como sus metabolitos secundarios principales. Sin embargo, de Roldana y Robinsonecio (subtribu Tussilagininae) no se han aislado APs. Un caso especial es el género Pseudogynoxys para el cual no se han reportado ni APs ni eremofilanos.

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La biodiversidad en Chihuahua : estudio de estado

Barajas¹,

Angón²,

Fernández³

et al. 2014

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Total 3 131 término ecosistema tiene su origen en la cultura occidental, en civilizaciones tradicionales existen conceptos parecidos que los pueblos ancestrales han acuñado para expresar la complejidad del entorno natural en el que desarrollan sus actividades (Berkes et al. 1998). Cabe señalar que, al igual que el concepto de especies, es un término que no se ha librado de controversias y discusiones científicas y filosóficas constantes (Gignoux et al. 2011). El Convenio sobre la Diversidad Biológica (cdb) formula la siguiente definición de ecosistema: "[es] un complejo dinámico de comunidades vegetales, animales y de microorganismos y su medio no viviente que interactúan como una unidad funcional" (cdb 1992), la cual, para efectos de una definición sencilla y aprobada por 193 países, puede resultar práctica. 72 918 7 305 322 856 4.49 Estado (total/promedio) 247 455 12 141 3 241 444 13.1 Fuente: elaboración propia con datos de Murillo 2007.Fuente: elaboración propia con datos de Murillo 2007.Cuadro 10. Eventos de educación, capacitación y difusión en materia ambiental relacionados con la biodiversidad, los cuales impulsó la delegación de la semarnat en Chihuahua durante el periodo 2004-2007. Evento Año Localidad Curso-taller "Programa Globe". Se impartió a docentes de diversas instituciones educativas del estado

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A geo-historical perspective on the distribution and variation in Senecio s.l. (Asteraceae, Senecioneae) in Mexico and C. America

Cited by 3 publications

References 12 publications

Taxonomìc analysis of Senecio pauciflorus and S. indecorus (Asteraceae)

Taxonomìc analysis of Senecio pauciflorus and S. indecorus (Asteraceae)

Secondary Metabolites from Mexican Species of the Tribe Senecioneae (Asteraceae)

La biodiversidad en Chihuahua : estudio de estado

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