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'Rosa damascena portlandica bifera' rose References
Book  (Feb 1993)  Page(s) 79, 80.  Includes photo(s).
Portland Rose Parentage: Unknown, but reputedly 'Quatre Saisons' x 'Slater's Crimson China', with possible R. centifolia involvement. It is also suggested that 'Quatre Saisons' and a Gallica rose were responsible. Released by Dupont in Paris in 1809, but date of origin is probably prior to that.... progenitor of the Portland group... Discussion of origins and naming... It caused a sensation at the time with its bright red colouring and ability to reflower in the autumn...
Book  (1993)  Page(s) 82, 83.  Includes photo(s).
[Listed under 'The Portland Rose'] Portland. Description. ('Scarlet Four Seasons' Rose') Flowers: light crimson, yellow stamens. Strong Damask fragrance.
Book  (1993)  Page(s) 36.  Includes photo(s).
Portland Rose ('Scarlet Four Seasons', Rosa x portlandica) Named after the second duchess of Portland who was one of the first people to grow it in England. Of uncertain origin, known since 1775. (Possibly Rosa gallica x 'Autumn Damask'). Description.
Book  (Jun 1992)  Page(s) 22.  
('Portland Rose', 'Portlandica', 'Duchess of Portland') Damask Perpetual. Unknown, ca. 1170. Descriptive information from primary sources.
Book  (May 1992)  Page(s) 2.  Includes photo(s).
Book  (1992)  Page(s) 58.  
[Listed under 'Portland Rose'] ('Duchess of Portland', 'Paestana') Portland shrub; cerise red, gold stamens; blooms of medium size, single to semi-double; growth shrubby, 3 x 3 ft (90 x 90 cm); dead-head old flowers for repeat bloom; light scent. A rose of this name seems to have been catalogued 1782; may be of Italian origin; released in France by Dupont 1809 perhaps from an English source. There may be different roses under this nme. OGR.
Book  (1991)  Page(s) 20.  
Scarlet Four Seasons its origin is obscure... flowers from midsummer until autumn if dead-headed... reputedly a hybrid between R. gallica and the Autumn Damask... the brightest red...
Book  (1988)  Page(s) 15.  
'Slater's Crimson China' [was] lost for years, than found again in 1956, naturalized in Bermuda! To this, or something similar, we owe the origin of the first east-west hybrid … the 'Duchess of Portland' … the other parent was maybe a Gallica or Damask… it came to England around 1800 … it was the first hybrid to combine the eastern genes for extended flowering with the western ones for hardiness and vigour, and it was the bringer of red into our garden roses.
Article (magazine)  (1988)  Page(s) 29.  
[Colour description according to the CIELAB colour space (petal inside): L* = Lightness, a* = red-green axis, b* = yellow-blue axis]
'Portland' (= 'Duchess of Portland' 1800; bright scarlet-red), L* 44-45, a* 62-63, b* -2 to +1
Book  (1988)  Page(s) 54.  Includes photo(s).
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