Inermis or Boursault pleine.
"Roses and Rose Growing"
Rose Georgina Kingsley
The following include the best and most popular kinds:-R. Pseud-Acacia Decaisneana, a distinct form bearing light pinky flowers; R. Pseud-Acacia Bessoniana, with thornless branches and a dense head of refreshing Pea-green foliage; R. Pseud-Acacia angustifolia, with narrow leaves; R. Pseud-Acacia aurea, a conspicuous but not very constant golden leaved form; R. Pseud-Acacia Inermis, of which there are weeping, upright, and broad-leaved forms, has narrow leaves that are glaucous beneath, and the characteristic spines of the species are wanting or rarely well developed.
"Hardy Ornamental Flowering Trees and Shrubs"
A. D. Webster