Commercially available

• Frau Karl Druschki
• Reine des Neiges
• Schneekönigin (hybrid perpetual, Lambert 1901)
• Snedronningen
• Snow Queen (hybrid perpetual, Lambert, 1901)

98 favorite votes.  
Average rating: GOOD+.  

White, near white or white blend Hybrid Perpetual.
Registration name: Frau Karl Druschki
Exhibition name: Frau Karl Druschki

Bred by Peter Lambert (Germany, 1901).
Introduced in Australia by Hazlewood Bros. Pty. Ltd. in before 1911 as 'Frau Karl Druschki'.

Hybrid Perpetual.  

White or white blend.  None / no fragrance.  36 petals.  Average diameter 5.5".  Large, full (26-40 petals), borne mostly solitary, in small clusters, cupped, high-centered bloom form.  Occasional repeat later in the season.  Long, pointed buds.  

Armed with thorns / prickles, climbing, well-branched.  Dark green foliage.  
Height of up to 6' 7" (up to 200 cm).  Width of 4' (120 cm).

USDA zone 4b and warmer.  Very hardy.  a good subject for pegging.  Blooms tend to ball in wet weather.  prefers dry climates.  Disease susceptibility: susceptible to Mildew.  Prune lightly or not at all.  

Tetraploid

Schneekönigin is the German word for Snow Queen. 'Frau Karl Druschki' is the best known white Hybrid Perpetual, but it is completely lacking in scent. Some authorities consider it to be a Hybrid Tea.
[From Der Rose Zucht und Pflege by Olbrich, 1903, p. 253:]
C. Druschki, merchant in Görlitz, was a long-time president of the German Society of Rosefriends.