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''Aria rupicola'', commonly known as rock whitebeam, is a rare species of shrub or small tree best known from the
British Isles The British Isles are an archipelago in the Atlantic Ocean, North Atlantic Ocean off the north-western coast of continental Europe, consisting of the islands of Great Britain, Ireland, the Isle of Man, the Inner Hebrides, Inner and Outer Hebr ...
but also reported from Norway, Sweden and Russia. Reaching heights of 10 m,''New Flora of the British Isles'';
Clive Stace Clive Anthony Stace (born 1938) is a British botanist and botanical author. He studied at King's College London, graduated from University of London in 1959 and then studied at the Natural History Museum, London. He was awarded a PhD in 1963. H ...
; Third edition; 2011 printing
it grows in rocky woodland, scrub and cliffs, usually on limestone. The species reproduces apomictically (asexually via cloned seeds) and was presumably created by autopolyploidysation of the common whitebeam proper (''
Sorbus aria ''Aria edulis'', the whitebeam or common whitebeam, is a species of deciduous tree in the family ''Rosaceae''. The tree often forms new shoots around the trunk. Typically compact and domed, the plant has a few upswept branches and the leaves ha ...
s.str.''). It contains a tetraploidal set of
chromosome A chromosome is a package of DNA containing part or all of the genetic material of an organism. In most chromosomes, the very long thin DNA fibers are coated with nucleosome-forming packaging proteins; in eukaryotic cells, the most import ...
s (2n=4x=68). Stace gives ''Aria rupicola'' the following characteristics: * Leaves unlobed or lobed ≤1/20 of the way to the midrib. * Leaves with a single style of teeth or, weakly, two styles of teeth. * Leaves with 6 to 9 (rarely 4 to 10) pairs of lateral veins. * Leaves mostly 1.6 to 2.4 times longer than wide. * Leaves mostly widest in that half of the leaf furthest from the stalk. * Leaves usually obtuse (rarely acute) at apex. * Leaves have dense white hairs on lower surface. * Fruits 10-15mm across, warty. Rock Whitebeam-young plant.jpg, A young specimen Rock Whitebeam-leaf lower.jpg, Back of a leaf Rock Whitebeam-leaf upper 1.jpg, Upper surface of a leaf Rock Whitebeam-leaf upper 2.jpg, Upper surface of a leaf Rock Whitebeam-twig.jpg, Twig and part of a leaf


References


Further reading

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External links


Distribution map of ''S. rupicola''
Naturhistoriska riksmuseet The Swedish Museum of Natural History (), in Stockholm, is one of two major museums of natural history in Sweden, the other one being located in Gothenburg. The museum was founded in 1819 by the Royal Swedish Academy of Sciences, but goes bac ...
. {{Taxonbar, from1=Q41069022, from2=Q1335724 Rosaceae Flora of Europe