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'Semi-plena' rose References
Book  (1991)  Page(s) 18.  
The White Rose of York, R. 'Alba Semi-plena'... believed to be a hybrid between R. gallica and a white form of R. canina, the Dog Brier...
Book  (1988)  Page(s) 10.  
R. x alba 'Semi-plena' semi-double with golden stamens... taken by Edward IV (1461-70) as his personal badge and thus became the White Rose of York.
Book  (1988)  Page(s) 41.  Includes photo(s).
One of the oldest varieties of R. x alba and said to be grown still in quantity in Bulgaria, around Kazanluk [sic], north of Plovdiv, for attar. It makes a large bush, up to 2 m high, with arching branches well covered with scented flowers. This is one of the toughest roses and is tolerant of anything except shade.
Book  (1987)  Page(s) 32.  
Redoute painted it at Malmaison.
Book  (1987)  Page(s) 9.  Includes photo(s).
Plate 9
Website/Catalog  (1986)  Page(s) 9.  
Alba Semi-Plena.....16th Century or earlier
Website/Catalog  (1986)  Page(s) 32.  
Rosa alba* (White Rose of York). Pure white, single flowers similar to the dog rose.  Foliage matt-green. Fruit oval and reddish-orange. Pre 16th Century.  P. W. H. F. (S) 6 x 4
Book  (1984)  Page(s) 71.  
Rosa x alba ‘Semiplena’ /Rosa x alba var suaveolens Dieck /Rosa x alba nivea /’Rose blanche’ /’Rose blanche d’York’= Parents = sans doute Rosa coriifolia var froebelii X Rosa x damascena. Existe depuis l’Antiquité. De nos jours, existe encore à l’état sauvage dans le Kurdistan et atteint peut-être la Crimée et le Caucase. Cultivé à Kazanlak, en compagnie de Rosa x damascena ‘Trigintipetala’ pour la fabrication de l’eau de rose et de l’huile de rose, moins odorant mais plus rustique. …feuillage d’une couleur extraordinaire: un vert comme recouvert de lait gelé et transparent, et les fleurs semi-doubles, d’un blanc à reflets de lait, elles aussi…
Article (website)  (1982)  Page(s) 8.  

Alba Semi-plena (alba) Semi-double pure white flowers borne on a graceful planti with matt grey leaves. Sweetly scented. Good heps in Autumn. 16th Century. W. H. (S) 6 x 5

Book  (1974)  Page(s) 47.  
Tess Allen.  Alba Roses. 
Friends of ours, the Whitfields live in one of the oldest inhabited small houses in Suffolk;  part of the house dates back to Henry VII.  In the forecourt there is a very old suckering shrub of Rosa alba maxima, and no one knows how many upheavals in the history of the house the rose has survived.  In summer the forecourt is brightened with the shrub's florescence of creamy-white roses;  when the double blooms first open the centres are flushed with pink.  The shrub is considered to be a double mutant of Rosa alba semi-plena;  it grows to a greater height than the sport and with half the number of petals a coronet of golden stamens is displayed in the centre of the flower.  R. alba semi-plena is also known as the 'White Rose of York' and in my opinion it is far more strongly scented than R. alba maxima.
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