A Revision of Senecio aureus Linn. and Allied Species

Barkley, T. M.

doi:10.2307/3626437

Cited by 30 publications

(18 citation statements)

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“…cotiterminus with S. ovinus Greene, a species not recognized in any recent works. Barkley (1962), Hulttn (1950, Cronquist (1955), Ferris (1960), and Moss (1959) all regard S. ovinus as conspecific with S. resedifoliris.…”

Section: Introductionmentioning

confidence: 94%

“…Barkley (1962) regards both S . resedifolius and S. hyperborealis as having disjunct distributions between the Alaska-Yukon area and the Rocky Mountains of southwestern Alberta (and adjacent parts).…”

Section: Introductionmentioning

confidence: 96%

“…Its distribution was given by Greenman (1916) as "Montana and Wyoming to Washington and California" and its distribution has only been marginally extended since publication of this information. This is the accepted range of the species today, given by Barkley (1962) and Cronquist (1955). With respect to S .…”

Section: Introductionmentioning

confidence: 97%

“…Three of these species fall within the circumpolar area covered by Polunin (1959); S. Izyperborealis is regarded by him as conspecific with S. resedifolius while S. contermitzus is maintained as a distinct species but is said to be possibly conspecific with S. resedifolius. Barkley (1962) discusses all four species but recognizes only three, regarding S . conterminus as conspecific with S .…”

Section: Introductionmentioning

confidence: 98%

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A taxonomic and phytogeographical review of some arctic and alpine Senecio species

Packer¹

1972

Can. J. Bot.

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PACKER, J. G. 1972. A taxonomic and phytogeographical review of some arctic and alpine Serlecio species. Can. J. Bot. 50: 507-518. A review is presented of the taxonomy of four arctic and (or) alpine species of Senecio, S . contermitzus Greenman, S . I~yperborealis Greenman, S . reseciolirrs Less., and S. cyrnbolarioides Buek. Of these, the first three have been recently claimed by one authority or another to have disjunct distributions between the Alaska-Yukon area and the Rocky Mountains. Investigations based on morphology (including that of the pollen) and cytology confirm the recognition of the four species and have furnished clear evidence for the recognition of a new species, S . ogotorukerrsis Packer, a description of which is provided. It isconcluded from the author's understanding of the taxonomy of these species that none has a disjunct distribution between the Alaska-Yukon area and the Rocky Mountains.PACKER, J. G. 1972. A taxonomic and phytogeographical review of some arctic and alpine Seriecio species.Can. J. Bot. 50: 507-518. L'auteur examine la taxonomie de quatre especes arctiques et (ou) alpines de Setlecio: S . cot~termitzrrs Greenman, S . hyperborealis Greenman, S . reserlifolirrs Less. et S. cymbnlarioides Buek. Parmi ces especes, les trois premieres ont une aire de distribution qui, d'apres certains auteurs rkents, presenterait une discontinuite entre la region de ]'Alaska-Yukon et les montagnes Rocheuses. Des recherches fondees sur la morphologie (y compris celle du pollen) et la cytologic ont confirm6 I'existence des quatre especes et ont clairement dtmontre I'existence d'une nouvelle espece, S. ogotorrrkeusis Packer, qui est dkrite. La conception de I'auteur sur la taxonomie de ces especes I'amtne a conclure que, dans leur distribution, aucune ne prtsente une discontinuite entre la region de ]'Alaska-Yukon et les montagnes Rocheuses.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

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A taxonomic and phytogeographical review of some arctic and alpine Senecio species

Packer¹

1972

Can. J. Bot.

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“…Earlier, he had described some of these phases as consisting of populations that had resulted from introgression involving S. streptanthifolius and related species (Barkley, 1962). Bain and Denford (1985) studied the flavonoids of this array of phases: borealis (2x), borealis (4x), laetiflorus, leonardi, rubricaulis, streptanthifolius, and suksdorfii.…”

Section: Senecio Streptanthijoliusmentioning

confidence: 99%

Flavonoids of the Sunflower Family (Asteraceae)

Bohm

Stuessy

2001

120

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This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machines or similar means, and storage in data banks. This book is dedicated to:Arthur Cronquist Outstanding plant systematist and major contributor to understanding taxonomic relationships within Asteraceae and Ralph E. Alston (1925Alston ( -1967) Visionary natural products chemist and geneticist who pioneered the use of chemical data in studies of plant systematics and evolution PrefaceCertainly many of the readers of this book will remember the early developments of chemosystematics in the late 1950s. We ourselves remember the excitement of these new data bearing on plant interrelationships. The hopes were high, the techniques were rapidly evolving, the quantities of data were large, and young workers were eagerly enthusiastic. Some even went so far as to predict that chemical data would soon replace morphological information as the basis for plant classification. These overly zealous predictions did not materialize, of course, as the history of plant systematics has amply shown during the past two centuries. If there is any distinct characteristic of systematics it is synthesis, as Lincoln Constance (1964) called it, the "unending synthesis." New tools generate new data and provide insights on additional dimensions of plant relationships. This will never change-we will continue to discover new tools and new data in the years ahead, and they will continue to be incorporated into the predictive general reference system of classification.The earlier efforts in chemosystematics focused on secondary plant products: alkaloids, betacyanins, carbohydrates, cyanogenic glycosides, glucosinolates, lipids, terpenoids, and especialiy flavonoids. The latter were particularly well suited for chemosystematic investigation for several reasons: ease of isolation and characterization, small amounts of plant material needed for analysis, stability of compounds especially through routine preparation of herbarium specimens, and low cost to obtain useful information. As a result of these considerable advantages, literally thousands of studies on use of flavonoids in plant systematics have been published. Although now with the present zest for macromolecular data from DNA restriction sites and sequences, there are fewer workers and laboratories dedicated to flavonoid chemosystematic studies; twenty years ago they were the new currency of exciting data in plant systematics.Because of many workers historically interested in the sunflower family, Asteraceae (or Compositae), in part due to its large size (approximately 23,000 species;Bremer, 1994), and because hundreds of flavonoid compounds were discovered in this family, many chemosystematic investigations have been completed on various taxa. Many studies came from the laboratories of R. A. Alston, B. L. Turner, and T. J. Mabry in the Department of Botany ...

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Compositae‐ParaLoss‐1272: A complementary sunflower‐specific probe set reduces paralogs in phylogenomic analyses of complex systems

Moore‐Pollard,

Jones,

Mandel

2024

Appl Plant Sci

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PremiseA family‐specific probe set for sunflowers, Compositae‐1061, enables family‐wide phylogenomic studies and investigations at lower taxonomic levels, but may lack resolution at genus to species levels, especially in groups complicated by polyploidy and hybridization.MethodsWe developed a Hyb‐Seq probe set, Compositae‐ParaLoss‐1272, that targets orthologous loci in Asteraceae. We tested its efficiency across the family by simulating target enrichment sequencing in silico. Additionally, we tested its effectiveness at lower taxonomic levels in the historically complex genus Packera. We performed Hyb‐Seq with Compositae‐ParaLoss‐1272 for 19 Packera taxa that were previously studied using Compositae‐1061. The resulting sequences from each probe set, plus a combination of both, were used to generate phylogenies, compare topologies, and assess node support.ResultsWe report that Compositae‐ParaLoss‐1272 captured loci across all tested Asteraceae members, had less gene tree discordance, and retained longer loci than Compositae‐1061. Most notably, Compositae‐ParaLoss‐1272 recovered substantially fewer paralogous sequences than Compositae‐1061, with only ~5% of the recovered loci reporting as paralogous, compared to ~59% with Compositae‐1061.DiscussionGiven the complexity of plant evolutionary histories, assigning orthology for phylogenomic analyses will continue to be challenging. However, we anticipate Compositae‐ParaLoss‐1272 will provide improved resolution and utility for studies of complex groups and lower taxonomic levels in the sunflower family.

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A Revision of Senecio aureus Linn. and Allied Species

Cited by 30 publications

References 0 publications

A taxonomic and phytogeographical review of some arctic and alpine Senecio species

A taxonomic and phytogeographical review of some arctic and alpine Senecio species

Flavonoids of the Sunflower Family (Asteraceae)

Compositae‐ParaLoss‐1272: A complementary sunflower‐specific probe set reduces paralogs in phylogenomic analyses of complex systems

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