Tags: Cultivar (Cultivated Variety).
The American Elm Ulmus americana ‘Pendula’ is considered probably just a forma by Green although it was originally listed by William Aiton in Hort. Kew 1: 320 1789 as U. americana var. pendula cloned in England in 1752. NB: ‘Pendula’ was later confused with a pendulous variant of U. glabra.