Ulmus laevis var. parvifolia
| Ulmus laevis var. parvifolia | |
|---|---|
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Rosales |
| Family: | Ulmaceae |
| Genus: | Ulmus |
| Species: | |
| 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
[edit]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
[edit]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
[edit]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
[edit]- ^ 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.