English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The Caucasus is one of the richest areas in the world in terms of animal and plant diversity, harbouring 6400 plant species. As a part of the Northern Caucasus, the Stavropol Heights are renowned for their local endemism, highlighted by six species of flowering plants endemic to this area. One of them is the annual species  Euphorbia normannii , described in 1891, but with uncertain taxonomic position. We here used nuclear ribosomal internal transcribed spacer and plastid  trn T– trn F sequences to infer the phylogenetic position of  E. normannii . The nuclear data inferred its position within  E.  sect.  Myrsiniteae , whereas the plastid data placed it within  E.  sect.  Pithyusa , thus indicating a hybrid origin. Relative genome size (RGS) data indicate that  E. normannii  has the highest RGS compared to three other annual species belonging to both sections ( E. aleppica ,  E. gaillardotii  and  E. falcata ). Our data are inconclusive whether  E. normannii  is of allopolyploid or homoploid hybrid origin, or whether later hybridisation and plastid capture from  E.  sect.  Pithyusa  was responsible for the incongruent phylogenetic signal. Morphologically,  E. normannii  is distinct, as are all three before-mentioned annuals, which fall in predominately perennial sections. However, the species most similar to  E. normannii  is  E. falcata  from  E.  sect.  Pithyusa  and therefore we propose inclusion of  E. normannii  in this section.

plant systematics and evolution

Evolutionary origin and systematic position of Euphorbia normannii (Euphorbiaceae), an intersectional hybrid and local endemic of the Stavropol Heights (Northern Caucasus, Russia)