Book  (2007)  
 
Tynwald, J. Mattock 1979
Blooming period: late
Habit: shrub with upright canes
Vigour: moderate
Prickles: present, moderately dense and straight
Flower: in clusters (3 or more), in racemes, sometimes solitary; sparse bloom; 48 petals; very full, cupped; diameter 10,0 cm; depth 3,2 cm; weak fragrance
Petals: rounded; length 4,7 cm; width 4,2 cm; colour of the upper surface white 155 C, reverse white 155 C; no nails
Stamens: anthers yellow, filaments whitish yellow
Stygmas: free, pink
Calyx: cupped, smooth
Sepals: horizontal; 1 appendage, either on one or on both sides, 2 sepals without
Foliage: length 13,0 cm, width 13,8 cm; colour of the upper surface dark green 147 A, reverse olive green 147 B; moderately glossy; length of the terminal leaflet 6,4 cm, width 4,6 cm; rounded base; 30 teeth per side
Fruit: length 2,1 cm; diameter 2,3 cm

Website/Catalog  (2000)  Page(s) 197.  
 
GR. Tynwald, Mattock J., 1979

Book  (2000)  Page(s) 605.  
 
‘Tynwald’ (MATtwyt) = Moderne - Buisson à grandes fleurs - Hybride de Thé – blanc, remontant. Description… Il marque le millénaire de Tynwald, parlement de l’île de Man et plus ancienne législature au monde toujours en vigueur. Zones 4-9. Mattock, Royaume-Uni, 1979. ‘Peer Gynt’ x ‘Isis’.

Website/Catalog  (23 Oct 1998)  Page(s) 13.  
 
Tynwald (MATTwyt) Hybrid Tea. Mattock 1979. Large very fragrant full cream blooms with ivory shading at the heart of the flowers are borne on sturdy stems which are good for cutting. The dark luxuriant foliage has proved to be remarkably disease-ressitant. The growth is tall and branching...

Website/Catalog  (23 Oct 1998)  Page(s) 10.  Includes photo(s).

Book  (1996)  Page(s) 83.  
 
Tynwald (MATTwyt) Large-flowered (Hybrid Tea) bush, creamy white, pleasing scent. 'Peer Gynt' x 'Isis'. Mattock (England) 1979.

Book  (Apr 1993)  Page(s) 617.  
 
Tynwald Hybrid Tea, cream, center yellow, 1979, (MATTwyt); 'Peer Gynt' x 'Isis'; Mattock. Description.

Book  (1993)  Page(s) 150.  Includes photo(s).
 
Hybrid Tea. Mattock (Britain) 1979. ('Peer Gynt' x 'Isis) Repeats. Good disease resistance. Height: 120 cm (4 ft.) Well scented.