| 词条 | Ulmus 'Betulaefolia Nigrescens' |
| 释义 |
| cultivar = 'Betulaefolia Nigrescens' | image = | image_caption = | origin = Belgium }} The elm cultivar Ulmus 'Betulaefolia Nigrescens', the Black Birch-leaved Elm, reportedly a seedling of a purplish-leaved elm, was first described by Pynaert in 1879 as U. campestris betulaefolia nigrescens.[1][2] An U. campestris betulaefolia nigrescens Hort. was distributed by the Späth nursery, Berlin, in the 1890s and early 1900s.[3] Green considered the 1930s' cultivar U. nigricans (U. 'Nigricans') a synonym of 'Betulaefolia Nigrescens'.[2]The cultivar is not to be confused with Pynaert's U. campestris latifolia nigricans, described in the same 1879 publication (Green's U. 'Latifolia Nigricans' ). DescriptionThe tree was said to have dark, birch-shaped leaves.[2] Späth's cultivar was described in his 1903 Catalogue as having "brownish leaves".[4] No herbarium leaf-specimens of this cultivar are known. Pests and diseasesNot known. CultivationNo specimens are known to survive. One tree was planted in 1897 as U. campestris betulaefolia nigrescens, the 'Black Birch-leaved Elm', at the Dominion Arboretum, Ottawa, Canada.[5] Three specimens supplied by Späth to the RBGE in 1902 as U. campestris betulaefolia nigrescens may survive in Edinburgh, as it was the practice of the Garden to distribute trees about the city (viz. the Wentworth Elm);[6] the current list of Living Accessions held in the Garden per se does not list the plant.[7] A specimen of U. 'Betulaefolia Nigrescens', obtained from Späth before 1914, stood in the Ryston Hall arboretum, Norfolk,[8] in the early 20th century.[9] The cultivar is not known to have been introduced to Australasia. AccessionsNone known. References1. ^{{cite journal|last1=Pynaert|first1=Édouard-Christophe|title=Trois nouvelles variétés d'Ormes|journal=Bulletins d'arboriculture, de culture potagère et de floriculture|date=1879|pages=57|url=https://archive.org/stream/bulletinsdarbor01unkngoog#page/n69/mode/2up|accessdate=14 December 2016}} {{Elm species, varieties, hybrids, hybrid cultivars and species cultivars |state=collapsed}}2. ^1 2 {{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}} 3. ^{{cite book |date=1902–1903|title=Katalog|publisher=L. Späth Baumschulenweg|location=Berlin, Germany|volume=108|pages=132–133|url=https://commons.wikimedia.org/wiki/File:L._Sp%C3%A4th_Baumschulenweg_Katalog_1903_pages_131-133.pdf}} 4. ^{{cite book |date=1902–1903|title=Katalog|publisher=L. Späth Baumschulenweg|location=Berlin, Germany|volume=108|pages=132–133|url=https://commons.wikimedia.org/wiki/File:L._Sp%C3%A4th_Baumschulenweg_Katalog_1903_pages_131-133.pdf}} 5. ^{{Cite book|last1=Saunders|first1=William|last2=Macoun|first2=William Tyrrell|url=https://archive.org/stream/bulletinissues00ottogoog#page/n80/mode/2up/|title=Catalogue of the trees and shrubs in the arboretum and botanic gardens at the central experimental farm|year=1899|edition=2|pages=74–75}} 6. ^{{cite book |date=1902|title=Accessions book|publisher=Royal Botanic Garden Edinburgh|pages=45, 47|url=https://commons.wikimedia.org/wiki/File:Royal_Botanic_Garden_Edinburgh._(1902)._Accessions_book_pages_45,47.jpg}} 7. ^{{cite web|title=List of Living Accessions: Ulmus|publisher=Royal Botanic Garden Edinburgh|access-date=21 September 2016|url=http://elmer.rbge.org.uk/bgbase/livcol/bgbaselivcol.php?eti=Ulmus&countOnly=&cfg=bgbase%2Flivcol%2Fbgbaselivcol.cfg&acc__num=}} 8. ^rystonhall.co.uk/ 9. ^{{cite book| title=Ryston Hall Arboretum catalogue |date=c. 1920 |pages=13–14|url=https://commons.wikimedia.org/wiki/File:Ryston_Hall_Arboretum_Catalogue_c._1920_pages_13,14.jpg}} 5 : Ulmus|Unconfirmed derivation elm cultivar|Ulmus articles missing images|Missing elm cultivars|Ulmus Edinburgh Spath 1902 |
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