Genotyping‐by‐sequencing resolves relationships in Polygonaceae tribe Eriogoneae

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