7 favorite votes.  

Mauve or mauve blend Hybrid Tea.
Registration name: Twilight (hybrid tea, Boerner 1955)

Bred by Eugene S. Boerner (United States, before 1955).
Introduced in United States by Jackson & Perkins Co. (Newark, NY) in 1955 as 'Twilight'.
Introduced in Australia by Hazlewood Bros. Pty. Ltd. in 1956 as 'Twilight'.

Hybrid Tea.  

Lavender - lilac, silver(y) reverse.  Moderate fragrance.  30 to 35 petals.  Average diameter 4.5".  Large, full (26-40 petals), borne mostly solitary, in small clusters, high-centered bloom form.  Blooms in flushes throughout the season.  Medium, pointed, ovoid buds.  

Medium, bushy, upright, well-branched.  Medium, glossy, medium green foliage.  5 to 7 leaflets.  

USDA zone 6b through 9b (default).  Can be used for beds and borders, cut flower or garden.  

United States - Patent No: PP 1,434  on  8 Oct 1955   VIEW USPTO PATENT
Application No: 486,747  on  7 Feb 1955