Rosa × alba, the white rose of York, is a hybridrose of unknown parentage[1] that has been cultivated in Europe since ancient times.[2] It may have originally been grown mainly for the sweet scent of the flowers, but is now also used as a winter-hardy garden shrub.[2] Cultivated forms have white or pink flowers, and most have many petals. Hybrid cultivars have also been produced with red or yellow flowers.[2]
Rosa × alba plants are tall shrubs with arching stems and bluish-green leaves. They bloom only in mid summer. They are extremely cold hardy and disease resistant, hence they are used to create new varieties for subarctic climates like northern Scandinavia and Canada. These magnificent shrubs can withstand shade and semishade, and are easily found abandoned in semi wild situations. In Sweden and Finland the French bred 'Minette' has been considered a wild rose called R. × suonum (Mustialanruusu). The Mustiala rose belongs to the Finns' tradition of roses "and is unknown outside the Nordic countries, although in 1819 it was bred in France".[3] Found alba roses are very common in Germany; some may be local variations, but some could be old cultivars waiting to be renamed.
Parentage hypothesesedit
Rosa × alba is hexaploid,[1] with six sets of chromosomes in each cell, which means that it interbreeds only rarely with the more common diploid, tetraploid, and pentaploid roses. Maskew and Primavesi concluded in 2005 that a 1993 suggestion by Graham and Primavesi that it was derived by chromosome duplication from a triploid offspring of R. arvensis (diploid) and R. gallica (tetraploid) had been mistaken.[1]R. alba shares some nuclear DNA sequences with R. canina and may be derived from hybridization between that species and R. gallica.[4]
Alba cultivarsedit
Cultivars of Rosa × alba that are still grown include:[2]
^ abcMaskew, R.; Primavesi, A.L. (2005). "What is Rosa alba L.?" (PDF). Watsonia. 25: 412–413.
^ abcdPhillips, R.; Rix, M. (2004). "Alba roses". The Ultimate Guide to Roses: A Comprehensive Selection. Macmillan. pp. 50–59. ISBN1-4050-4920-0.
^(in Finnish) article "Rosa 'Minette' / mustialaros, nordisk ros" via Sanoma News Oy
^Wissemann, V.; Ritz, C.M. (2005). "The genus Rosa (Rosoideae, Rosaceae) revisited: molecular analysis of nrITS-1 and atpB-rbcL intergenic spacer (IGS) versus conventional taxonomy". Botanical Journal of the Linnean Society. 147 (3): 275–290. doi:10.1111/j.1095-8339.2005.00368.x.
rosa, alba, confused, with, heraldic, emblem, white, rose, york, white, rose, york, hybrid, rose, unknown, parentage, that, been, cultivated, europe, since, ancient, times, have, originally, been, grown, mainly, sweet, scent, flowers, also, used, winter, hardy. Not to be confused with the heraldic emblem the White Rose of York Rosa alba the white rose of York is a hybrid rose of unknown parentage 1 that has been cultivated in Europe since ancient times 2 It may have originally been grown mainly for the sweet scent of the flowers but is now also used as a winter hardy garden shrub 2 Cultivated forms have white or pink flowers and most have many petals Hybrid cultivars have also been produced with red or yellow flowers 2 Rosa albaScientific classificationKingdom PlantaeClade TracheophytesClade AngiospermsClade EudicotsClade RosidsOrder RosalesFamily RosaceaeGenus RosaSpecies R albaBinomial nameRosa albaL Cultivar Konigin von Danemark is a pink flowered Alba rose Contents 1 Description and distribution 2 Parentage hypotheses 3 Alba cultivars 4 See also 5 References 6 External linksDescription and distribution editRosa alba plants are tall shrubs with arching stems and bluish green leaves They bloom only in mid summer They are extremely cold hardy and disease resistant hence they are used to create new varieties for subarctic climates like northern Scandinavia and Canada These magnificent shrubs can withstand shade and semishade and are easily found abandoned in semi wild situations In Sweden and Finland the French bred Minette has been considered a wild rose called R suonum Mustialanruusu The Mustiala rose belongs to the Finns tradition of roses and is unknown outside the Nordic countries although in 1819 it was bred in France 3 Found alba roses are very common in Germany some may be local variations but some could be old cultivars waiting to be renamed Parentage hypotheses editRosa alba is hexaploid 1 with six sets of chromosomes in each cell which means that it interbreeds only rarely with the more common diploid tetraploid and pentaploid roses Maskew and Primavesi concluded in 2005 that a 1993 suggestion by Graham and Primavesi that it was derived by chromosome duplication from a triploid offspring of R arvensis diploid and R gallica tetraploid had been mistaken 1 R alba shares some nuclear DNA sequences with R canina and may be derived from hybridization between that species and R gallica 4 Alba cultivars editCultivars of Rosa alba that are still grown include 2 Rosa Alba Foliacea Rosa Alba Maxima Rosa Alba Semi plena Rosa Alba Suaveolens Rosa Amelia Rosa Belle Amour Rosa Blanche de Belgique Rosa Celeste Rosa Chloris Rosa Felicite Parmentier Rosa Great Maiden s Blush Rosa Jeanne d Arc Rosa Konigin von Danemark Rosa Mme Legras de St Germain nbsp Mme Plantier Hybrid cultivars include Rosa Mme Plantier an old rose with feathery sepals and cream flowers fading to white Rosa Crimson Blush with red flowers introduced 1988 Rosa Lemon Blush with pale yellow flowers introduced 1988 Rosa Morning Blush white with pink and red edges introduced 1988 Rosa Royal Blush with pale pink flowers introduced 1988 Rosa Tender Blush with pale apricot flowers introduced 1988See also editRosa damascena Nonadecane NerolReferences edit a b c Maskew R Primavesi A L 2005 What is Rosa alba L PDF Watsonia 25 412 413 a b c d Phillips R Rix M 2004 Alba roses The Ultimate Guide to Roses A Comprehensive Selection Macmillan pp 50 59 ISBN 1 4050 4920 0 in Finnish article Rosa Minette mustialaros nordisk ros via Sanoma News Oy Wissemann V Ritz C M 2005 The genus Rosa Rosoideae Rosaceae revisited molecular analysis of nrITS 1 and atpB rbcL intergenic spacer IGS versus conventional taxonomy Botanical Journal of the Linnean Society 147 3 275 290 doi 10 1111 j 1095 8339 2005 00368 x External links edit nbsp Media related to Rosa alba at Wikimedia Commons https whiteroseshub com meaning of white roses Retrieved from https en wikipedia org w index php title Rosa alba amp oldid 1161545890, wikipedia, wiki, book, books, library,
