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Mertensia : ウィキペディア英語版
Mertensia

''Mertensia'' is a genus of flowering plants in the family Boraginaceae. They are perennial herbaceous plants with blue or sometimes white flowers that open from pink-tinged buds. Such a change in flower color is common in Boraginaceae and is caused by an increase of pH in the flower tissue. ''Mertensia'' is one of several plants that are commonly called "bluebell". In spite of their common name, the flowers are usually salverform (trumpet-shaped) rather than campanulate (bell-shaped).
''Mertensia'' is native to most of North America and to a large part of Asia from western China to northeastern Russia.〔Mare Nazaire, Xiao-Quan Wang, and Larry Hufford. 2014. "Geographic origins and patterns of radiation of ''Mertensia'' (Boraginaceae)". ''American Journal of Botany'' 101(1):104-118. .〕 Its center of diversity is in the Rocky Mountains. ''Mertensia'' is mostly restricted to alpine, subalpine, and montane habitats.〔Mare Nazaira and Larry Hufford. 2014. "Phylogenetic Systematics of the Genus ''Mertensia'' (Boraginaceae)". ''Systematic Botany'' 39(1):268-303. .〕 Notable exceptions are ''Mertensia maritima'', a maritime plant of Arctic and subarctic coastlines, and ''Mertensia virginica'', which is found from the Appalachian Mountains west to Minnesota, Iowa, and Missouri.〔 Most of the species are endemic to very small areas of the Rocky Mountains.
''Mertensia virginica'' has the largest flowers in the genus and is commonly cultivated. It is sparingly naturalized in Europe. About 12 other species are known in cultivation.〔Anthony Huxley, Mark Griffiths, and Margot Levy (1992). ''The New Royal Horticultural Society Dictionary of Gardening''. The Macmillan Press,Limited: London. The Stockton Press: New York. ISBN 978-0-333-47494-5 (set).〕 The Inuit ate the rhizomes of ''Mertensia maritima''.〔David J. Mabberley. 2008. ''Mabberley's Plant-Book'' third edition (2008). Cambridge University Press: UK. ISBN 978-0-521-82071-4 (see ''External links'' below).〕
Many of the species of ''Mertensia'' are hard to distinguish and some are possibly cryptic.〔 Around 150 species names have been published in ''Mertensia''.〔''Mertensia'' in Tropicos (See ''External links'' below).〕 Most authors have recognized about 45 species,〔 but in 2014, the authors of a molecular phylogenetic study recommended the acceptance of at least 62.〔
== Species ==
Author citations are from Tropicos〔 or the International Plant Names Index.〔''Mertensia'' in International Plant Names Index. (see ''External links'' below).〕

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