The ultimate form of 'Camperdownii' depends on such factors as latitude and location, on what part of the parent tree the cuttings come from, on the 'stock' on which it is grafted, and on possible continuing mutation.

Henry, quoting Koch, said that 'Serpentina' was sold in nurseries as the Parasol Elm,[1] which was distinguished from Ulmus campestris pendula by having larger leaves.

[1][21] An U. serpentina was described in the journal Nature in 1918: "The branches are curiously contorted and reflexed, while all the shoots from one to three years old are pendulous rods, which, with the beautiful foliage, form an exterior covering reaching to the ground".

The journal Nature reported in July 1918 "a remarkable elm of the variety known as Ulmus serpentina, apparently about sixty years old, vigorously growing in a Croydon garden".

Späth's U. montana serpentina was planted in 1897 at the Dominion Arboretum, Ottawa, Canada, which, though it contained some eighty elm cultivars by the turn of the century, had no specimen labelled 'Camperdownii'.

[27] A specimen of U. montana serpentina obtained from Späth before 1914, and planted in 1916, stood in the Ryston Hall arboretum, Norfolk,[28] in the early 20th century.

[29] A 1920 photograph taken at Hortus Botanicus, Leiden, showing a weeping tree, is captioned Ulmus scabra [: U. glabra Huds.]