Book  (2013)  Page(s) 168.  
 
A similar problem arises with a rose which, for simplicity, will be referred to intially as Cantabrigiensis. This very attractive clear yellow single rose originated as a seedling in the Cambridge University botanic garden and was recognised in 1931. On the basis of its morphology its putative parents were thought to be R. hugonis and R. sericea so that it could be referred to as R. x cantabrigiensis. Austin (1988) refers to it as R. pteragonis Cantabrigiensis. Matters fall into place if we regard R. pteragonis as itself a hybrid, R. hugonis X R. sericea, and refer to it more informatively as R. x pteragonis.

Book  (1996)  Page(s) 86.  
 
R. x pteragonis = R. hugonis x R. pteracantha. Bred by Max Krause in Holstein. Characteristics between the parents. Light yellow, larger bloom with 5 petals. Form of shrub and prickles like R. pteracantha.

Book  (Aug 1990)  Page(s) 42-44.  Includes photo(s).
 
Rosa x pteragonis Introduced 1938. Flowers bloom in a glowing, light canary yellow mass... Tiny, fernlike leaves... a beautiful shrub with masses of light yellow flowers from early May through June... often grown as hedges to deter trespassers, for they are armed with distinctively large "thorns" -- beautiful jewel-like red prickles that glimmer like rubies when the sun shines through them...

Book  (1988)  Page(s) 168.  
 
location 112/3, 146/16; R. x pteragonis Krause (R. hugonis X r. sericea f. pteracantha), PIMPINELLIFOLIAE, Max Krause, 1938, light yellow, single, mild fragrance, medium size, very early-blooming, floriferous, bushy, upright, 2-3 m, branched, bristles + prickles, light-medium green very small matte foliage, 9-11 leaflets, blood-red small glossy pear-shaped thickened fruit with stalk, reflexed persistent short sepals, ripe very early

Book  (1981)  Page(s) 255.  
 
R. x pteragonis Krause
f. pteragonis (R. hugonis x R. sericea pteracantha). Originated with Max Krause, Hasloh, Holstein, N. Germany in 1938.

Book  (1981)  Page(s) 104-105.  Includes photo(s).
 
The armature of R. hugonis is very variable....The existence of pteracanthous forms of R. hugonis suggests the possibility at least that some roses in cultivation which combine translucent wing-prickles with yellow flowers are forms of R. hugonis and not hybrids between it and R. sericea var. pteracantha as usually supposed. Such plants are usually grouped together under the heading R. x pteragonis, this being the name given to a plant raised in Germany and supposed to be R. sericea var. pteracantha x R. hugonis. One of the roses in question is 'Hidcote Gold', of which the original plant grew at Hidcote Manor.

Magazine  (Aug 1970)  Page(s) 3. trimester, p. 23.  
 
L'hybride Rosa pteragonis est issu de Rosa Hugonis et de Rosa omeiensis pteracantha.

(1954)  Page(s) 192.  
 
[From "History of the Rose", by Roy Shepherd, 1954]
PTERAGONIS and RED WING—These more closely resemble the pollen parent, R. omeiensis pteracantha, and are discussed in that group (page 000).

Website/Catalog  (1941)  Page(s) 39.  
 
Rosa pteragonis. Wild rose with reddish branches and decorative, feathery foliage, blackish red prickles, and bright yellow single blooms, very early-blooming. ...Low garden plants 1 piece RM [Reichsmark] 1.50  10 pieces RM 13.50 

Magazine  (1939)  Page(s) 60.  
 
Pteragonis Hybrid hugonis (M. Krause....