From Macoboy's Roses, in the species roses section, page 22:

"Rosa foliolosa 'Anne Endt' ['e' on the end of Ann not a typo] Shrub

'Anne Endt' is a selected form of a very graceful species from Oaklahoma and Arkansas, making luxuriant, almost thornless bush with lush bright green foliage (foliolosa, given by Thomas Nuttall, means 'leafy') which colors brightly in autumn, or fall. The large carmine flowers appear late and then continue, a few at a time, until the autumn, or fall, when there are round, deep pink hips to be seen.

Late-summer flowering
Fragrant"

Don't know where he got 'nearly thornless from... mine is typically 'rugosaly' armed. Are there any other references to 'Ann Endt' alluding to the possibility of it just being a garden selected form of foliolosa instead of rugosa x foliolosa? Mine seems to set large amounts of seed and I get lots of self seeded seedlings around it. The OP seedlings develop very rugose new leaves, that suggest rugosa heritage, but as they mature they 'flatten out'. 'Ann Endt' does the same and mature leaves end up looking only slightly rugose.