Edaphic and Geographic Origins of Varietal Differentiation In<i>Eriogonum calcareum</i>

Brown, Brittni J.; Mansfield, Donald H.

doi:10.3120/0024-9637-64.1.22

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…This analysis, the TreeMix analysis (Fig. 6), and previous observations (Reveal, 1989) indicate that varietal variation may coincide with edaphic characteristics, similar to the repeated evolution of ecotypes of Heliosperma pusillum on distinct soils (Trucchi & al., 2017) and the association of varieties of E. calcareum with edaphic variation (Brown & Mansfield, 2017). However, particular patterns of divergence and subsequent geneflow in E. umbellatum are not supported here (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Further, molecular data support the species status of E. calcareum , previously a variety within E. ochrocephalum (Grady & Reveal, 2011). Additional varietal variation within E. calcareum is supported by differences in ecology and distribution (Brown & Mansfield, 2017), which depending on the level of threat and genetic diversity within those populations could also have conservation ramifications.…”

Section: Discussionmentioning

confidence: 99%

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Genotyping‐by‐sequencing resolves relationships in Polygonaceae tribe Eriogoneae

Pearman

Alioto

Trotta

et al. 2021

TAXON

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The resolution of cryptic diversity is essential for understanding the evolutionary diversification of lineages and establishing conservation priorities. We examine relationships in Eriogoneae (Polygonaceae), a diverse lineage in western North America. We ask whether Eriogonum umbellatum, a morphologically and ecologically diverse species, is monophyletic and whether its varieties represent evolutionary lineages. We use genotyping‐by‐sequencing to assemble a SNP dataset for 51 species in the genera Chorizanthe, Eriogonum and Sidotheca. We report a hierarchical phylogenetic analysis using maximum likelihood to estimate the evolutionary history of Eriogoneae. We illustrate admixture components for 21 populations of E. umbellatum, representing four varieties, and test for lineage structure using TreeMix. We identify strongly supported clades within Eriogoneae. Many relationships in the Eucycla + Oregonium and Latifolia clades are supported, while most relationships within the Eriogonum subg. Oligogonum clade and a clade with most Chorizanthe remain unresolved. Eriogonum congdonii resolves within the main E. umbellatum clade, while populations of three varieties of E. umbellatum are closely related to E. ursinum and are associated with serpentine soils. ADmixture and TreeMix analyses suggest E. umbellatum varieties represent evolutionary lineages. These results from SNP data are largely consistent with previous phylogenetic studies of Eriogoneae based on sequence variation. Structure within Oligogonum suggests consistent environmental association and radiation after initial colonization of serpentine. Morphology is unreliable for the infraspecific taxonomy of E. umbellatum. Additional molecular studies are needed to resolve the evolutionary relationships and ecological diversification within this species, in Oligogonum, and in Eriogoneae.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Genotyping‐by‐sequencing resolves relationships in Polygonaceae tribe Eriogoneae

Pearman

Alioto

Trotta

et al. 2021

TAXON

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“…These slopes of powdery soils and friable rock are sparsely vegetated, forming edaphic islands of open ground within a more densely vegetated surrounding matrix of sagebrush steppe. Numerous other plants having narrow geographical ranges occupy similar ashy slopes elsewhere in dry interior regions of western North America ( Grimes 1984 ; Reveal and Björk 2004 ; Brown and Mansfield 2017 ). The Lemhi Valley is lined on the east and west by alpine ridges, and the valley floor sits at a high elevation, making it cooler than the sagebrush steppes both further south on the adjacent Snake River Plains and further north in the Salmon-Challis Valleys region.…”

Section: Taxonomic Treatmentmentioning

confidence: 99%

Townsendia lemhiensis (Asteraceae, Astereae): A narrowly endemic new species from Idaho, USA

Lee¹,

Björk²,

Whitton³

2022

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Townsendia lemhiensis (Asteraceae) is described from the Lemhi Valley of east-central Idaho. From a genus with weak intrinsic isolating barriers, T. lemhiensis remains distinct apparently due to apomixis and to its isolation and habitat specialization on spatially limited occurrences of ashy white soils in the Lemhi Valley. Despite similarities to T. spathulata, this new species differs in its persistent pappus, fewer series of phyllaries and sericeous rather than long woolly hairs.

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Pronounced Genetic Separation Among Varieties of the Primula cusickiana Species Complex, a Great Basin Endemic

2022

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Abstract— Distinguishing between populations with strong genetic structure and unique species is a common challenge in systematics, especially for taxa occurring in fragmented habitats where allopatric speciation may be widespread and distinct groups may be morphologically similar. Such is often the case with species complexes across sky island environments. In these scenarios, biogeography may help to explain the taxonomic relations between species complex members, and restriction site-associated DNA (RAD) sequencing methods are commonly used to compare closely related taxa across thousands of loci. Here we use RADseq to clarify the boundaries separating the geographically distinct but morphologically similar varieties of the Primula cusickiana species complex, and to contextualize past findings of strong genetic structure among populations within varieties. Our genetic analyses demonstrate pronounced separation between isolated populations of this Great Basin endemic, indicating that the current varietal classification of complex members is inaccurate, and emphasizing their conservation importance. We discuss how these results correspond to recent biogeographical models used to describe the distribution of other sky island taxa in western North America. Our findings also fit into a wider trend observed for alpine Primula species complexes, and we consider how edaphic specialization and heterostylous breeding systems may be contributing to frequent diversification via allopatric speciation in this genus.

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Edaphic and Geographic Origins of Varietal Differentiation InEriogonum calcareum

Cited by 4 publications

References 28 publications

Genotyping‐by‐sequencing resolves relationships in Polygonaceae tribe Eriogoneae

Genotyping‐by‐sequencing resolves relationships in Polygonaceae tribe Eriogoneae

Townsendia lemhiensis (Asteraceae, Astereae): A narrowly endemic new species from Idaho, USA

Pronounced Genetic Separation Among Varieties of the Primula cusickiana Species Complex, a Great Basin Endemic

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Edaphic and Geographic Origins of Varietal Differentiation InEriogonum calcareum

Cited by 4 publications

References 28 publications

Genotyping‐by‐sequencing resolves relationships in Polygonaceae tribe Eriogoneae

Genotyping‐by‐sequencing resolves relationships in Polygonaceae tribe Eriogoneae

﻿Townsendia lemhiensis (Asteraceae, Astereae): A narrowly endemic new species from Idaho, USA

Pronounced Genetic Separation Among Varieties of the Primula cusickiana Species Complex, a Great Basin Endemic

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Townsendia lemhiensis (Asteraceae, Astereae): A narrowly endemic new species from Idaho, USA