Ulmus 'Densa'

The elm cultivar Ulmus Densa was described from specimens growing near Ashkabad as U. densa Litv. in Schedae ad Herbarium Florae Rossicae (1908). Litvinov, reporting it growing wild in the mountains of Turkestan, Ferghana, and Aksu, as well as in cultivation, considered it a species, a view upheld by the Soviet publications Trees and Shrubs in the USSR (1951) and Flora of Armenia (1962), and by some current plant lists. Other authorities take it to be a form of U minor, distinctive only in its dense crown and upright branching. The Moscow State University herbarium gives (2020) Ulmus minor as the "accepted name" of U. densa Litv..

Litvinov considered U. minor 'Umbraculifera', with its "denser crown and more rounded form", a cultivar of U. densa, calling it U. densa var. bubyriana. Rehder (1949) and Green (1964), ignoring reports of the wild form, considered U. densa a synonym of 'Umbraculifera'. The U. densa photographed by Meyer in Aksu, Chinese Turkestan on his 1911-12 expedition does not appear to be the tidy grafted cultivar 'Umbraculifera' and was said to be named 'Seda'. Zielińksi in Flora Iranica (1979) considered 'Umbraculifera' an U. minor cultivar.

In its natural range U. densa overlaps with U. pumila. The extent of hybridization between the two is not known.