Newsletter  (May 2015)  Page(s) 24.  Includes photo(s).
 
[From "Suckering Roses Revisited", by Darrell g.h. Schramm, pp. 23-27]
Among the Portlands I find four roses that cautiously amble away from home—never far. These are ‘Delambre’ (1863), ‘Duchesse de Rohan’ (1847), ‘Indigo’ (1830), and ‘Rose de Rescht’ (reintroduced in 1949).

Book  (1997)  Page(s) 176.  
 
Indigo Portland. Laffay (France) c. 1830. Description and cultivation... flowers: deep purple with an occasional thin white stripe on some of the petals...

Book  (1994)  Page(s) 45.  Includes photo(s).
 
Indigo Laffay, France c 1830  Good upright bushes with smooth long leaves of good green. Hispid Hep. This is a spectacular rich, dark purple rose, with expanded shape, flushed with dark crimson, showing a few stamens, and occasionally a white streak or mark. Warm scent. Fine display at midsummer and again later. Perhaps the richest and most effective of dark purple roses. 4 feet (Plage 18)

Book  (1993)  Page(s) 80.  
 
Portland. Description. Flowers: dark purple, large. Circa 1830.

Book  (1936)  Page(s) 360.  
 
Indigo (HP) Laffay ca. 1830; bright garnet-purple, occasionally shaded carmine-pink, large, double, flat. = Pérpetuelle indica.

Magazine  (Jul 1907)  Page(s) 256.  
 
En 1844-45, Victor Varangot, de Melun, met au commerce : Perpétuelle Mogador, franchement remontante, et Laffay, qui hésitait encore à user du vocable hybride remontant, signale : Comtesse Tanneguy-Duchatel. Perpétuelle à fleurs ponctuées, Mistress Crips, Perpétuelle indigo, Hybride de Bourbon, Mousseux, Princesse Adélaïde, qu’il indique comme Hybrides 'perpétuelles.

Book  (1899)  Page(s) 82.  
 
Indigo, HR, Laffay, grenat foncé

Book  (1899)  Page(s) 142.  
 
Pérpetuelle indigo, HR, grenat vif, syn. Indigo

Book  (1880)  Page(s) Annex, p. 63.  
 
hybrid perpetual, Indigo (Laffay), dark purple, someimes shaded pink-carmine, large, double, flat, very conspicious.

Book  (1858)  Page(s) 168, 193.  
 
p. 168: Rosa damascena bifera. Indigo, (Laffay), large, double, dark purple, generally slaty, flat.

p. 193: Hybrid perpetual Perpetuelle Indigo, (Laffay), velvety dark violet.