| 词条 | Ulmus 'Densa' |
| 释义 |
|image = File:Ulmus densa.jpg |image_caption = 'Densa' | origin = C. Asia }} The elm cultivar Ulmus Densa was described from specimens growing near Ashkabad as U. densa Litv. in Schedae ad Herbarium Florae Rossicae (1908).[1] 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)[2] and Flora of Armenia (1962),[3] and by some current plant lists.[4][5] Other authorities take it to be a form of U minor, distinctive only in its dense crown and upright branching.[6][7][8] Litvinov considered U. minor 'Umbraculifera', with its "denser crown and more rounded form", a cultivar of U. densa,[6] calling it U. densa var. bubyriana. Rehder (1949) and Green (1964), ignoring reports of the wild form, considered U. densa a synonym of 'Umbraculifera'.[9][10] 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'.[11][12] Zielińksi in Flora Iranica (1979) considered 'Umbraculifera' an U. minor cultivar.[13] In its natural range U. densa overlaps with U. pumila. The extent of hybridization between the two is not known. DescriptionLitvinov noted that the tree "differed little from U. glabra Mill." [:U. minor] except in its erect branches and dense oblong crown.[14] The leaves were "generally smaller" and the branches "smooth and lighter in colour". As with the hybrid U. × androssowii, its compact branch structure helps the tree conserve moisture.[15] Pests and diseasesNot known. CultivationLitvinov said that U. densa was "widely cultivated" in gardens in Turkestan. It appears to be one of a number of elms known locally as 'karagach' [:'black tree' = elm].[16] In western Europe U. densa Litv. was distributed by Hesse's Nurseries, Weener, Germany, in the 1930s.[17] CultivarsThese include one of the oldest of elm-cultivars, 'Umbraculifera', and a number of elms introduced to the West by the Späth nursery of Berlin.
Meyer (1912) identified three cultivars of U. densa: 'Stamboul', 'Kitaisky' and 'Seda'.[18][12] Hybrid cultivarsThe tree, or its cultivar form 'Umbraculifera', has hybridised with U. pumila to produce U. × androssowii. AccessionsNone known. References1. ^Schedae ad Herbarium Florae Rossicae , VI. 163-165 (1908) 2. ^{{cite book |last= Sokolov |first= S. Ya|date=1951 |pages=504–505 |title= Деревья и кустарники СССР|trans-title= Trees & Shrubs in the USSR |url=http://biology.krc.karelia.ru:8080/biology/%D0%9E%D0%BF%D1%80%D0%B5%D0%B4%D0%B5%D0%BB%D0%B8%D1%82%D0%B5%D0%BB%D0%B8%20%D1%84%D0%BB%D0%BE%D1%80%D1%8B%20%D0%B8%20%D1%84%D0%B0%D1%83%D0%BD%D1%8B/%D0%94%D0%B5%D1%80%D0%B5%D0%B2%D1%8C%D1%8F%20%D0%B8%20%D0%BA%D1%83%D1%81%D1%82%D0%B0%D1%80%D0%BD%D0%B8%D0%BA%D0%B8%20%D0%A1%D0%A1%D0%A1%D0%A0.%20%D1%82%D0%BE%D0%BC%201-7%20(1949-1965)/|language= Russian|volume=2|location= Moscow}} 3. ^{{cite book |last= Takhtajan |first= Armen Leonovich|date=1962 |pages=341–342 |title= Флора Армении|trans-title= Flora of Armenia|language= Russian|volume=4|location= Yerevan}} 4. ^The Plant List: Ulmus densa Litv., accessdate: December 14, 2016 5. ^Tropicos: Name - Ulmus densa Litv., accessdate: December 14, 2016 6. ^1 {{cite book|last1=Elwes|first1=Henry John|authorlink1=Henry John Elwes|last2=Henry|first2=Augustine|authorlink2=Augustine Henry|date=1913|title=The Trees of Great Britain & Ireland|volume=7|pages=1893|url=https://archive.org/stream/treesofgreatbrit07elweuoft#page/1893/mode/2up}} 7. ^{{cite book|last1=De Langhe|first1=Jan|title=Vegetative key to species European cultivation (Ulmaceae)|date=7 April 2016|publisher=Ghent University Botanical Garden|location=Ghent|page=5|url=http://arboretumwespelaar.be/userfiles/file/pdf/Key_ULMACEAE_JDL.pdf#page=6|accessdate=18 December 2016}} 8. ^Plantarium: Ulmus densa - Галерея субтаксонов - Плантариум (in Russian), accessdate: December 18, 2016 9. ^{{cite web |url=https://www.biodiversitylibrary.org/page/39585053#page/304/mode/1up |title=Bibliography of cultivated trees and shrubs hardy in the cooler temperate regions of the Northern Hemisphere |author=Alfred Rehder |page=142 |publisher=Arnold Arboretum of Harvard University |year=1949}} 10. ^{{cite journal |last=Green |first=Peter Shaw |authorlink=Peter Shaw Green |date=1964 |title=Registration of cultivar names in Ulmus|url=https://archive.org/stream/arnoldiaarno_21#page/40/mode/2up/|journal=Arnoldia |volume=24|pages=41–80 |number=6–8 |publisher=Arnold Arboretum, Harvard University |access-date=16 February 2017}} 11. ^Meyer's photograph (5675) of Ulmus densa Turkestan. Aksu, Turkestan. February 1911 12. ^1 Meyer's photograph (5676) of Ulmus densa Turkestan. Aksu, Turkestan. February 1911 13. ^J. Zielińksi, 'Ulmaceae', Flora Iranica, ed. K. H. Rechinger (Graz, 1979) 14. ^Photograph captioned U. densa, uses.plantnet-project.org 15. ^World Digital Library: [https://www.wdl.org/en/item/5747/ Elm Trees. Samarkand], accessdate: December 18, 2016 16. ^Rickmers, W. Rickmer, The Duab of Turkestan, a physiographic sketch and account of some travels (Cambridge, 1913), p.172 17. ^{{cite book|last1=Hesse|first1=Hermann Albert|title=Preis- und Sortenliste|date=1932|pages=96–97|url=https://archive.org/stream/HesseHermA1932#page/n96/mode/1up/|accessdate=18 January 2018}} 18. ^Meyer, F. N. (1912). [https://archive.org/stream/seedsplantsimpor282unit#page/52/mode/2up Seeds and plants imported during the period from January 1 to March 31, 1912]: Inventory No.30, Nos 32829–32831. Bureau of Plant Industry - Bulletin No. 282. Washington, Government Printing Office, 1913. External links
3 : Ulmus articles with images|Ulmus|Unconfirmed derivation elm cultivar |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。