Within the city of Dnipro (steppe zone of Ukraine) the invasive species Ulmus pumila forms massive thickets in decommissioned areas. The investigated site is located on the watershed on the site of the abandoned construction site. There buried building debris, the thickness of fertile soil is no more than 15 cm. Sometimes concrete slabs come to the surface. In young thickets (about 5-6 years), Ulmus pumila completely dominates. There are rare instances of Ulmus minor. But within the thickets there are young trees with outgrowths on branches (usually 1 order). I have never seen such outgrowths in Ulmus pumila before and did not find any references in the literature. They can be in our native species Ulmus suberosa (permanent sign) and rarely at Ulmus minor. But the leaf buds of these specimens are smaller than Ulmus minor buds and have 4 renal scales. Help clarify the form of the elm.
Thanks for the help
Ulmus pumila and U. minor hybridize freely, there's lots of literature on this. Therefore, in any area where both occur there will be many hybrids, and backcrosses of hybrids. Individual elms in such areas will have mixtures of characteristics. You'll find morphological 'pumila' that nevertheless have these corky 'wings' on twigs, you'll also find morphological 'minor' that nevertheless have small buds. These individuals cannot be assigned to any nominate species. DNA sequencing shows individuals to be complex mixtures (e.g. Biological Invasions 15(12) · December 2013). Indeed, where hybridization is so frequent, it's an open question whether nominate species like 'minor' or 'pumila' are really phylogentically distinct. Incidentally, these corky outgrowths are common on U. minor in the areas I know (France, Germany, UK).
Dear Friend：
I am not a researcher on forestry. but I got the following information for you. The Siberian Elm cultivar Ulmus pumila 'Harbin' is an older Manchurian selection.
Kindly
Li Kangmin
emeritus Prof
CAFS
Here in Czechia Ulmus minor creates outgrowths on branches pretty often.
Yours sincerely,
Ondrej Vitek
Thanks everyone who answered!
Andrei, I agree with your statement. In Ukraine Ulmus minor forms outgrowths on branches too. But in these exemplars elm – the buds is smaller than that of Ulmus minor (2.2-3 mm), and only 4 renal scales, as in Ulmus pumila. Maybe it's a hybrid?
Sincerely yours
Ivanko Irina
Aurelio, thank you for your interest and attention. But botanists are silent!
Irina
It should be Ulmus minor, in case of hybrid, at least one of the parents
Ulmus pumila and U. minor hybridize freely, there's lots of literature on this. Therefore, in any area where both occur there will be many hybrids, and backcrosses of hybrids. Individual elms in such areas will have mixtures of characteristics. You'll find morphological 'pumila' that nevertheless have these corky 'wings' on twigs, you'll also find morphological 'minor' that nevertheless have small buds. These individuals cannot be assigned to any nominate species. DNA sequencing shows individuals to be complex mixtures (e.g. Biological Invasions 15(12) · December 2013). Indeed, where hybridization is so frequent, it's an open question whether nominate species like 'minor' or 'pumila' are really phylogentically distinct. Incidentally, these corky outgrowths are common on U. minor in the areas I know (France, Germany, UK).
Thank you, dear colleagues.
To be honest, I first saw such specimens in urban conditions among thickets of Ulmus pumila. U. minor in the steppe zone in dry conditions of the steppe (along forest edges, on slopes) almost never forms such pronounced corky outgrowths. There may only be mild growths. In the classical Ulmus suberosa (photo) in the natural environment, corky outgrowths are very large. I will seek literature on this issue and contact my geneticists. We have fenced the thickets and will follow the trend.
Irina
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