Japan Flora: Shrub with very sparingly prickly branches, the prickles slender, spreading, scarcely flattened, the fertile branchlets slightly elongate, 7-15 cm. long, pubescent and glandular-pilose; leaves 3-faliolate or sometimes the leaflets connate below in the upper ones, the terminal leaflets ovate- elliptic or narrowly ovate, 5-8 cm. long, 3-5 cm. wide, acumi­nate, doubly toothed, pubescent on both sides especially on the nerves, scarcely to very shortly petioluled〉the stipules lanceo­late; flowers 1 or 2, the pedicels 3-6 cm. long, pubescent and glandular-pilose, often bracteate near the middle; calyx glan­dular-pilose and short-pubescent, 12-18 mm. long, the lobes rather thick, acuminate, densely puberulent inside; petals white, ovate-orbicular, 15-20 mm. in diameter; carpels nearly glabrous. Apr.-May.

Honshu (Kanto Distr. and Nagato Prov.), Kyushu (n. distr.). Bonins.