12 favorite votes.  

Deep pink Species.

Bred by Niels Ebbesen Hansen (United States, 1938).
Discovered by Wendy Lawrenson (United States, 2003).

Species Cross.  

Rose-red, ages to purple .  14 petals.  Average diameter 2".  Cluster-flowered, in large clusters bloom form.  

Tall, few or no prickles/thorns, upright.  

Height: 6' to 8' (185 to 245cm).  Width: 6' to 8' (185 to 245cm).

USDA zone 4a through 9b.  

'Pax Apollo'

(R. sempervirens pallida x pollen of R. blanda from southern Manitoba)

A wonderful producer of deep pink flowers in large clusters in
June. Petals about 14. Tall, upright, 7 foot, dark red stems; the wood is
smooth; on strong shoots the midrib of the leaf is bristly.

Diploid

Hansen's description of 'Pax Apollo' according to his 1940 "Progress in
Thornless Roses" ARS article has some information on his early work and mentions
the roses he was using in his breeding program. He states "Three varieties
of what I am glad to call Pax roses were introduced in the spring of 1938.
Pax is the Latin for peace, and thorns are no more necessary in roses than
war is among humans! These Pax roses are nearly or quite thornless. "

The quest for the exact identity of Rosa sempervirens pallida continues....

Ploidy information from David Zlesak.