Magazine  (2019)  Page(s) 51. Vol 41, No. 1.  
 
Margaret Furness.  Tea, Noisette and China Mislabels in Australia.
Poly-Teas and Chinas.
Roses sold here as Irène Watts are usually Grüss an Aachen or Pink Grüss an Aachen.

Website/Catalog  (2017)  Page(s) 50.  Includes photo(s).
 
Irene Watts China 1896.  Gracefully flat and loose blooms on a compact little bush.  Very free flowering.  Low bush. 

Magazine  (2015)  Page(s) 7, No. 50.  
 
David Stone, The Conservation of Old Rose Varieties at Mottisfont.
‘Irene Watts’ was first received by me from James Russell who had acquired it from Sangerhausen. Described as a ‘China Hybrid’, this densely petalled and very fragrant little rose showed little affinity with the loosely petalled and generally scentless ‘China’s’,  but it was such a beautiful and accommodating variety that I made it available to several notable nurseries who immediately added it to the catalogue. It was a couple of years later that I found the same rose sporting from a group of ‘ Gruss an Aachen’ and recognised it as the deeper pink form ‘Pink Gruss an Aachen’.  I immediately made my error known but, unfortunately, only Peter Beales eventually condescended to change their catalogue entry. The problem that I encountered was that ‘Pink Gruss an Aachen’ was simply not considered an attractive enough name, whereas ‘Irene Watts’ was.  “What’s in a name?”  To the true rosarian, everything!

Website/Catalog  (13 Jul 2012)  
 
'Pink Gruss an Aachen' (Fl?; Kluis – 1929). A light warm pink sport of the classic ‘Gruss an Aachen’, it resembles its parent in growth habit, stem and foliage, but the blooms are more full with more ‘spiky’, less reflexed petals. 1.2m x 1m.

Article (website)  (30 Oct 2008)  
 
“We became aware that Irene Watts was wrong a few years ago and I have now corrected this to Pink Gruss an Aachen.”

[from Peter Beales Roses forum, October 30, 2008:
The link was http://www.peterbealesroses.com/forum/viewtopic.php?id=1369 but it no longer links to this discussion. Refer Comments.]

Article (magazine)  (2007)  Page(s) 404.  
 
Table 1. Comparison of key volatile components in representative cultivated Chinese roses and species. [adsorption volume by Solid Phase Microextraction (peak area, x10')]
DMMB: 1,3-dimethoxy-5-methylbenzene
TMB: 1,3,5-trimehoxybenzene

'Irene Watts' [the rose in commerce under this name is 'Pink Gruss an Aachen']
Nerol 8.92
Beta-phenylethyl alcohol 0.46
Dihydro-beta-ionone 3.55
Beta-ionone 0.29
DMMB 14.5

Book  (2004)  Page(s) 128. 238.  
 
p128.  Pink Gruss an Aachen Is a much deeper pink (than Gruss an Aachen) but in all other respects exactly the same, and just as charming I confess to being one of a number of nurserymen who, until recently, have distributed the pink form erroneously as 'Irene Watts', A mistake I regret but have now rectified.

p238.  Pink Gruss an Aachen Itnroduced Kluis & Koning, Holland 1929.  Sport of 'Gruss an Aachen'. An old floribunda equally as good as its parent. Smallish clusters of fully double, fragrant flowers in salmon and pink.  Foliage rich green, leathery. Growth short, bushy.   

Website/Catalog  (Jun 2003)  
 
"Irène Watts - Imported from Peter Beales. Planted in 1982. Budwood distributed in Australia under the name Irène Watts but came to realise identity was wrong. It was the pinker form of Gruss an Aachen. This was confirmed when I visited Peter Beales Roses." 

[Information from David Ruston regarding the provenance of certain roses in his collection and budwood nursery. Private correspondence, June 2003.  refer Comments.]

Website/Catalog  (22 Dec 1998)  Page(s) 28.  Includes photo(s).
 
Irene Watts Antique China. Guillot fils 1896. Description... silken blooms of soft apricot that age to buff white... 

Book  (Dec 1998)  Page(s) 314.  Includes photo(s).
 
Irène Watts China. Guillot (France) 1896. Description... long apricot buds that reveal pale pink, double blooms with large petals and a button eye...