Ulmus 'Planeroides'
Encyclopedia
The cultivar 'Planeroides' was described by Carrière
in Revue Hort. 1875: 287, fig. 48, 1875, but identified as "possibly Ulmus carpinifolia (: minor)" by Green .
http://arnoldia.arboretum.harvard.edu/pdf/articles/1605.pdf
Élie-Abel Carrière
Élie-Abel Carrière was a French botanist, based in Paris. He was a leading authority on conifers in the period 1850-1870, describing many new species, and the new genera Tsuga, Keteleeria and Pseudotsuga. His most important work was the Traité Général des Conifères, published in 1855, with a...
in Revue Hort. 1875: 287, fig. 48, 1875, but identified as "possibly Ulmus carpinifolia (: minor)" by Green .
Description
The tree was described as having leaves like Planera aquaticaPlanera aquatica
Planera aquatica, or Water Elm is single species in the southeastern U.S.A., a small deciduous tree 10-15 m tall, closely related to the Elms but with a softly, prickly nut 10-15 mm diameter, instead of a winged seed. It grows, as the name suggests, on wet sites. The leaves are 3-7 cm long, with a...
http://arnoldia.arboretum.harvard.edu/pdf/articles/1605.pdf