Ulmus 'Columella' is a Dutch elm cultivar raised by the Dorschkamp Research Institute for Forestry & Landscape Planning, Wageningen.
Originally thought to have been derived from a selfed or openly pollinated seedling of the hybrid clone 'Plantyn', DNA analysis later determined it arose from a cross of 'Plantyn' and Ulmus minor.
Sown in 1967, it was released for sale in 1989 after proving extremely resistant to Dutch elm disease following injection with unnaturally high doses of the pathogen, Ophiostoma novo-ulmi.
The rough, rounded, and twisted leaves, < 7 cm (3 in) long, are the result of a recessive gene inherited from its Exeter elm ancestor, and are arranged in asymmetric clusters on short branchlets.
[4] In trials conducted by Butterfly Conservation in southern Hampshire, England, 'Columella' was the only cultivar to become distressed during the drought of 2006, shedding most of its foliage by early August; a trait possibly inherited from one of the tree's ancestors, the Himalayan elm Ulmus wallichiana.