Ulmus pumila 'Pinnato-ramosa'
The Siberian elm cultivar Ulmus pumila 'Pinnato-ramosa' was raised by Georg Dieck, as Ulmus pinnato-ramosa, at the National Arboretum, Zöschen, Germany, from seed collected for him circa 1890 in the Ili valley, Turkestan by the lawyer and amateur naturalist Vladislav E. Niedzwiecki while in exile there. Litvinov (1908) treated it as a variety of Siberian elm, U. pumila var. arborea but this taxon was ultimately rejected by Green, who sank the tree as a cultivar: "in modern terms, it does not warrant recognition at this rank but is a variant of U. pumila maintained and known only in cultivation, and therefore best treated as a cultivar". Herbarium specimens confirm that trees in cultivation in the 20th century as U. pumila L. var. arborea Litv. were no different from 'Pinnato-ramosa'.
'Pinnato-ramosa', Royal Botanic Garden Edinburgh, planted 1902
U. pumila var. arborea
Bole of RBGE tree
Bark of specimen in University of Belgrade Botanical Garden
Ulmus pumila, the Siberian elm, is a tree native to Asia. It is also known as the Asiatic elm and dwarf elm, but sometimes miscalled the 'Chinese elm'. U. pumila has been widely cultivated throughout Asia, North America, Argentina, and southern Europe, becoming naturalized in many places, notably across much of the United States.
Ulmus pumila
Bark (Korea)
Stump showing rapid stem diameter increase (>40 millimetres (1+1⁄2 in) per annum)
Summer foliage