The Systematics of the <i>Spiranthes cernua</i> Species Complex (Orchidaceae): Untangling the Gordian Knot

Pace, Matthew C.; Cameron, Kenneth M.

doi:10.1600/036364417x696537

Cited by 17 publications

(31 citation statements)

References 43 publications

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“…However, given our geographically expansive sampling, examples of hybridization/chloroplast capture between these two species as exhibited by S . × stellata and other hybrid Spiranthes in eastern North America (Pace & Cameron, ) appear to either be rare or absent. Thus it may be tentatively suggested that any intermediate characters found in individual plants or populations of S .…”

Section: Discussionmentioning

confidence: 94%

“…This challenge is similar to the S . cernua species complex (Sheviak, ; Pace & Cameron, ) and other morphologically recalcitrant orchid species complexes (e.g., the Encyclia chloroleuca (Hook.) Neumann and Specklinia endotrachys (Rchb.f.)…”

Section: Discussionmentioning

confidence: 99%

“…× kapnosperia M.C.Pace, and S . niklasii M.C.Pace (Pace & Cameron, ). Conversely, a hybrid origin has not been supported for several putatively hybrid species; these plants instead represent species of non‐hybrid origin or morphological extremes within non‐hybrid species.…”

Section: Introductionmentioning

confidence: 99%

“…s.str. does not appear to engage in pervasive hybridization with any other species (Pace & Cameron, , ); the ambiguously described S . × folsomii P.M.Br.…”

Section: Introductionmentioning

confidence: 99%

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The evolutionary and systematic significance of hybridization between taxa ofSpiranthes(Orchidaceae) in the California Sierra Nevada and Cascade Range

Pace

Cameron

2019

TAXON

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The morphologically overlapping and frequently syntopic species of Spiranthes (Orchidaceae) found in the Sierra Nevada of California and Cascade Range of Oregon-S. porrifolia, S. romanzoffiana, and S. stellata-have long been a source of taxonomic confusion. Much of this confusion is attributed to hypothesized hybridization between species, and a lack of agreement concerning the distinctiveness of S. stellata from S. romanzoffiana. We used molecular phylogenetics incorporating low-copy nuclear, nuclear ribosomal, and chloroplast DNA sources, in addition to morphological data, to clarify the evolutionary relationships of this complex. Our results indicate that contrary to long-held hypotheses, hybridization between S. porrifolia and S. romanzoffiana appears to be rare or absent. Furthermore, a realignment of taxon status is necessary for S. stellata subsp. stellata and S. stellata subsp. perexilis, with subsp. perexilis elevated to full non-hybrid species rank as S. perexilis comb. & stat. nov., and subsp. stellata changed to S. ×stellata, indicating its likely recurrent allopolyploid origin between the sister species S. perexilis and S. romanzoffiana. We also describe S. ×sierrae nothosp. nov., representing rare allopolyploid hybrids between S. perexilis and S. porrifolia, and provide the first pollinator records for S. perexilis and S. ×stellata.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…s.str. does not appear to engage in pervasive hybridization with any other species (Pace & Cameron, , ); the ambiguously described S . × folsomii P.M.Br.…”

Section: Introductionmentioning

confidence: 99%

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The evolutionary and systematic significance of hybridization between taxa ofSpiranthes(Orchidaceae) in the California Sierra Nevada and Cascade Range

Pace

Cameron

2019

TAXON

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“…The diversity of orchids and superficial similarity of related species often leads to erroneous identification of taxa [91,92]. The detailed studies on various orchids revealed that numerous commonly recognized species are actually species-complexes that include several distinct species [93][94][95].…”

Section: Importance Of Taxonomy and Plant Materials Preservationmentioning

confidence: 99%

Orchidaceae-Derived Anticancer Agents: A Review

Śliwiński

Kowalczyk

Sitarek

et al. 2022

Cancers

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Species of orchids, which belong to the largest family of flowering plants, are commonly used in folk medicine for the treatment of infections and tumors. However, little is known about the actual chemical composition of these plants and their anticancer properties. In this paper, the most recent literature on orchid-derived bioactive substances with anticancer properties is reviewed. For the assessment, previous papers on the anticancer activity of Orchidaceae published since 2015 were considered. The papers were found by exploring electronic databases. According to the available data, many species of orchids contain potential antitumor chemicals. The bioactive substances in a relatively insignificant number of orchids are identified, and most studies are on Asian taxa. Broader research on American and African species and the correct identification of samples included in the experiments are essential for evaluating the usefulness of orchids as a plant family with vast anticancer potential.

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Once more unto the breach, dear friends: Resolving the origins and relationships of the Pellaea wrightiana hybrid complex

Windham

Huiet

Metzgar

et al. 2022

American J of Botany

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Premise The taxonomic status of Wright's cliff brake fern, Pellaea wrightiana, has been in dispute ever since it was first described by Hooker in 1858. Previously published evidence suggested that this “taxon” may represent a polyploid complex rather than a single discrete species, a hypothesis tested here using a multifaceted analytical approach. Methods Data derived from cytogenetics, spore analyses, leaf morphometrics, enzyme electrophoresis, and phylogenetic analyses of plastid and nuclear DNA sequences are used to elucidate the origin, relationships, and taxonomic circumscription of P. wrightiana. Results Plants traditionally assigned to this taxon represent three distinct polyploids. The most widespread, P. wrightiana, is a fertile allotetraploid that arose through hybridization between two divergent diploid species, P. truncata and P. ternifolia. Sterile triploids commonly identified as P. wrightiana, were found to be backcross hybrids between this fertile tetraploid and diploid P. truncata. Relatively common across Arizona and New Mexico, they are here assigned to P. ×wagneri hyb. nov. In addition, occasional sterile tetraploid plants assigned to P. wrightiana are shown here to be hybrids between the fertile allotetraploid and the tetraploid P. ternifolia subsp. arizonica. These tetraploid hybrids originated independently in two regions of parental sympatry (southern Arizona and west Texas) and are here assigned to P. ×gooddingii hyb. nov. Conclusions Weaving together data from a diversity of taxonomic approaches, we show that plants identified as P. wrightiana represent three morphologically distinguishable polyploids that have arisen through repeated hybridization events involving the divergent sexual taxa P. ternifolia and P. truncata.

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The Systematics of the Spiranthes cernua Species Complex (Orchidaceae): Untangling the Gordian Knot

Cited by 17 publications

References 43 publications

The evolutionary and systematic significance of hybridization between taxa ofSpiranthes(Orchidaceae) in the California Sierra Nevada and Cascade Range

The evolutionary and systematic significance of hybridization between taxa ofSpiranthes(Orchidaceae) in the California Sierra Nevada and Cascade Range

Orchidaceae-Derived Anticancer Agents: A Review

Once more unto the breach, dear friends: Resolving the origins and relationships of the Pellaea wrightiana hybrid complex

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