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The highest vascular plants on Earth

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Abstract

Mountaineering, since the beginning of its history, has played an inconspicuous but key role in the collection of species samples at the highest elevations. During two historical expeditions undertaken to reach the summit of Mount Everest in 1935 and 1952, mountaineers collected five species of vascular plants from both the north and south sides of the mountain, at ca. 6400 m a.s.l. Only one of these specimens was determined immediately following the expedition (Saussurea gnaphalodes), and the remaining four were not identified until quite recently. In 2000, the second specimen from the 1935 expedition was described as a new species for science (Lepidostemon everestianus), endemic to Tibet. In this paper, the remaining three specimens from the 1952 Everest expedition are reviewed and analysed, bringing the number of species sharing the title of “highest known vascular plant” from two to five. I identify one of the 1952 specimens asArenaria bryophylla, and describe two novel taxa based on analysis of the herbarium records:Saxifraga lychnitis var.everestianus andAndrosace khumbuensis. Although elevation records on their own do not inform us about the ecological conditions and physiological capacity of plants at the upper limit of their distribution, this taxonomic investigation contributes to our knowledge of the biogeography of Himalayan flora and opens the way for future field-based investigations of mechanisms limiting plant growth on the roof of the world.

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Fig. 1

Image: ©2018 DigitalGlobe, CNES/Airbus. Map data: ©2018 Google

Fig. 2

Drawing: C. Dentant

Fig. 3

Drawings: C. Dentant

Fig. 4

Drawings: C. Dentant

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Acknowledgements

I would like to acknowledge the herbarium curators who provided a decisive assistance for this study: Fred Stauffer and Laurent Gauthier (Conservatory and Botanical Garden of Geneva, G); Ranee Prakash (Natural History Museum of London, BM). I would also thank Fabien Anthelme and Hannah Marx for their advice for improving the manuscript. And finally a special thanks to Sonja Wipf for her indefatigable support and to Brad Carlson for his invaluable contribution in refining the manuscript.

Author information

Authors and Affiliations

  1. Ecrins National Park, Domaine de Charance, 05000, Gap, France

    Cédric Dentant

Authors
  1. Cédric Dentant

Contributions

C. Dentant analysed herbarium records at the Conservatory and Botanical Garden of Geneva and the British Museum, carried out research on historical expeditions to Mount Everest and wrote the paper.

Corresponding author

Correspondence toCédric Dentant.

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Conflict of interest

The author declares that he has no conflict of interest.

Electronic supplementary material

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ESM_1

Herbarium specimen ofSaussurea gnaphalodes (BM[000803807]) collected during the 1935 Everest expedition. Photo: Ranee Prakash (BM) (PDF 4675 KB)

ESM_2

Holotype ofLepidostemon everestianus (BM[000587908]), specimen collected during the 1935 Everest expedition. Photo: Ranee Prakash (BM) (PDF 4829 KB)

ESM_3

Herbarium specimen ofArenaria bryophylla (G[G00429530]) collected during the 1952 Everest expedition. Photo: G (PDF 5281 KB)

ESM_4

Holotype ofSaxifraga lychnitis var.everestianus (G[G00429528]), specimen collected during the 1952 Everest expedition. Photo: G (PDF 5583 KB)

ESM_5

Holotype ofAndrosace khumbuensis (G[G00429529]), specimen collected during the 1952 Everest expedition. Photo: G (PDF 6951 KB)

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