N.E. Hansen developed 25 roses: 'Alika' (brought from Siberia and introduced in 1906); 'Tetonkaha' 1912; 'Tegala' 1926; 'Amdo', 'Ekta', 'Kitana', 'Koza', 'Minisa', 'Okaga', 'Sioux Beauty', 'Teton Beauty', 'Yanka', 'Yatkan', 'Yuhla', 'Zani' and 'Zika' all introduced in 1927; 'Mrs. Mina Lindell (a found semi double wild rose) 1927, Semi (abreviated from Semipalatinsk, region of Siberia where seed of R. laxa was collected in 1913, introduced in 1927); 'Lillian Gibson'(nearly thornless) 1938; 'Pax Amanda', 'Pax Apollo' and 'Pax Iola' (all thornless, 1938); 'Yawa' (nearly thornless) 1940; and 'Zitkala' (nearly thornless) 1942.

N.E. Hansen also had a 'Hansen's Hedge' but I'm not sure of an introduction date. R. rugosa 'Hansa' is not named after him. However, Professor Budd at Iowa State University did name one of his rugosa crosses Professor N.E. Hansen after Hansen.

There is also some confusion with another breeder named N.J. Hansen who developed mostly hybrid tea roses. N.E. Hansen worked primarily with developing hardy shrub roses for the midwest and his later work focused on developing thornless roses.