Sorbus cibagouensis: A new species of Rowan from Tibet.

Trees and shrubs of the genus Sorbus are found across temperate the regions of Europe, Asia, and North America, where they are variously known as Rowans, Whitebeams, Service Trees or Mountain Ashes. They are members of the Rose Family, Rosaceae, and produce brightly coloured berries, which are consumed by Birds, helping to spread their seeds.

In a paper published in the Nordic Journal of Botany on 25 January 2017, Zhijian Yin, Mingxu Zhao, Fanglin Tang, and HongYan Sun of the China Forest Exploration and Design Institute and the Southwest Monitoring Center of Natural Reserve and Wildlife of the State Forestry Administration of the Peoples Republic of China, and Hua Peng of the Kunming Institute of Botany of the Chinese Academy of Sciences, describe a new species of Sorbus from the Cibagou National Nature Reserve in Zayü County in southeast Tibet.

The new species is named Sorbus cibagouensis, meaning 'from Cibagou'. It is a small tree, reaching about 6 m in height, with dark grey to black bark, leaves reaching 19 cm in length, but split into distinct leaflets, and produce white blossom. The species was found growing in a mixed conifer and broadleaved forest at an altitude of between 2600  and 2950 m above sealevel, though its distribution is not really known.

Sorbus cibagouensis, wild plant. Zhao Mingxu in Yin et al. (2017).

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A new species of Whitebeam from the Transdanubian Mountains of Hungary.

Trees and shrubs of the genus Sorbus are variously known as Rowans, Service Trees, Whitebeams and Mountain Ashes. They are members of the Rose Family (Rosaceae), found in Europe, Asia, North America and North Africa. The group contains between 100 and 200 species, many of which are hybrids, able to reproduce asexually and therefore propagate themselves. All the trees produce white flowers in spring and red, orange or yellow berries in autumn; the hybrid species do so without pollination taking place.

In a paper published in the journal Phytotaxa on 11 April 2014, Lajos Somlyay of the Hungarian Natural History Museum and Alexander Sennikov of the Botanical Museum of the Finnish Museum of Natural History and the Herbarium of the Komarov Botanical Institute of the Russian Academy of Sciences, describe a new hybrid species of Sorbus from western Hungary.

The new species is named Sorbus udvardyana, after László Udvardy, a distinguished Hungarian botanist who died in 2010. Sorbus udvardyana is a shrub or small tree producing brown shoots and dark green leaves and flowering in May. Its fruit are orangey brown. It was found growing in the Transdanubian Mountains, notably the western part of the Balaton Uplands, the western part of the Bakony Mountains,  and the eastern part of the Keszthely Mountains, typically growing as a solitary tree on cliffs or gravel slopes. 

A fruiting branch of Sorbus udvardyana. Somlyay & Sennikov (2014).

Sorbus udvardyana is thought to be a hybrid of Sorbus aria and another, unknown member of the genus (making it a Whitebeam). Somlyay & Sennikov estimate that it should be classed as Threatened under Hungarian law, and therefore given legal protection, and Vulnerable under the terms of the International Union for the Protection of Nature's Red List of Threatened Species.

See also...

 A new species of Cherry from central Zhejiang Province, China.

 New species of Vochysia from Brazil.

 A new species of Custard Apple from the Western Ghats Mountains of India.

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