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Ulmus laevis var. parvifolia
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Rosales
Family:	Ulmaceae
Genus:	Ulmus
Species:	U. laevis
Variety:	U. l. var. parvifolia
Trinomial name
	Ulmus laevis var. parvifolia; Jovanović & Radulović

Ulmus laevis var. parvifolia is a mutant variety of European white elm found exclusively on the island of Ada Ciganlija, in the Sava at Belgrade, Serbia.^[1]

Description

The tree is small and has a dense crown. The leaves are much smaller than those of the species, 21 – 59 mm (average 40 mm) in length by 14 – 36 mm (average 26 mm) width, and chartreuse in colour. The specimen of var. parvifolia on Ada Ciganlija is very slow-growing, attaining a height of only 5.5 m in almost 60 years, with a d.b.h. of just 13 cm.

Pests and diseases

Not known, but the species has a field resistance to Dutch elm disease, through the presence of a triterpene, Alnulin, in the bark which acts as an antifeedant to the vector Scolytus beetles.

Cultivation

The tree is not known to have ever flowered, thus propagation is by cuttings only. The variety is not known to be in commerce in Serbia or elsewhere.

References

^ Jovanović, B. & Radulović, S. (1980). O jednom novom varyetetu veza. (About a new variety of the European white elm (Ulmus laevis Pall. var. Parvifolia var. n.) Abstract in English.) Glasn. Prir. Muz. Beogradu, B. no. 35. 29-38 (1980). Museum of Natural History (Belgrade), Serbia.