Rosa maximowicziana Reg.

This species, a native of the Russian Far East, Manchuria and Korea, is fairly closely allied to R. multiflora, differing in having the leaflets glabrous beneath except for down on the midrib, more shallowly toothed stipules (incisions not more than half the width of the limb), glabrous inflorescence and larger flowers (11⁄2 to 2 in. long). The stems, at least the stronger ones, are armed with bristles as well as small hooked prickles. It may not be in cultivation in its typical state. In the cv. ‘Jackii’ the stems lack bristles, the stipules are scarcely toothed and the flowers are more numerous in each inflorescence than is usual in R. maximowicziana. It was described by Rehder (as R. jackii) from a plant raised at the Arnold Arboretum from seeds collected by J. G. Jack in 1905 near Seoul in Korea, and was subsequently placed under R. maximowicziana as var. jackii (Rehd.) Rehd. Although introduced to Kew in 1910 it was later lost and is not known to have spread into gardens.