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Following the 20th-century outbreak of Dutch elm disease only one American elm remains of the line which provided summer shade along the southern and western sides of the building.
The American Elm Ulmus americana cultivar 'Beaverlodge' was selected as a seedling in 1925 at the Beaverlodge Experimental Farm, Morden, part of the Lacombe Research Centre, Alberta, for its hardiness and vigour, and released in 1954.
'Brandon' is a cultivar of the American Elm Ulmus americana, raised by Lacombe Nurseries, Lacombe, Alberta, Canada, before 1969; it may be synonymous with another cultivar from the same source, known as 'Patmore'.
The American Elm Ulmus americana cultivar 'Delaware' was originally selected (as tree number 218) from 35,000 seedlings inoculated with the Dutch elm disease fungus in USDA trials at Morristown, New Jersey.
The American Elm Ulmus americana cultivar 'Klehmii' was cloned from a tree growing at Arlington Heights by Mr Charles Klehm, proprietor of the Charles Klehm & Son nursery.
The American Elm Ulmus americana cultivar 'Pyramidata' was a selection cloned by the Baudriller nursery, Angers, France, c.
It was first identified in 1929 on American elm (Ulmus americana) and was thought to belong to the order Sphaeropsidales but was later described as Cephalosporium sp.