This one is a mystery whose depths I have been unable to plumb.
From what I have been able to uncover, Nyveldt crossed Rosa rugosa rubra (=R. regeliana) with R. cinnamomea (=majalis), then crossed one or more of the hybrids with R. nitida, apparently a selection or hybrid named ‘Parfum’.
From the seedlings of this last cross (or crosses) he selected a white, a pink and a red. These seem to have collected synonyms. E.g., ‘Snow Hedge’ and ‘White Hedge’ and ‘Nyveldt’s White’ may be the same variety. ‘Pink Hedge’ and ‘Dutch Hedge’ may be the same, as may be ‘English Hedge’ and ‘Red Hedge’.
All the sources I’ve seen (except HelpMeFind) have R. rugosa rubra (one of the extra-hardy Russian rugosas). I don’t know how x Paulii came to be associated with these roses.
Or not.
American Rose Annual, vol. 50 (1965)
Dutch Hedge (A. A. Nijveldt ’58) Rosa rugosa x R. cinnamomea. Root-stock type. Ovoid bud. Pink, small, single blooms. Moderate fragrance. Many thorns. Vigorous growth.
Snow Hedge S (A. A. Nijveldt ’63) R. rubra x R. nitida. Ovoid bud. White, single blooms borne in cluster. Strong fragrance. Light green foliage, many thorns.
Nijveldts White Rg (A. A. Nijveldt ’58) R. rugosa x R. cinnamomea. Ovoid bud. White, large, single blooms. Slight fragrance. Many thorns. Vigorous growth.
Also, Krussmann (Manual of cultivated broad-leaved trees and shrubs, vol. 3, 1984) lists ‘Dutch Hedge’, ‘English Hedge’, ‘Pink Hedge’ and ‘Red Hedge’ separately.
Any suggestions?