A New Hybrid of Rubus (Rosaceae) from Japan, R. xgeraniifolius

摘要

A new hybrid of the genus Rubus, R. xgeraniifolius Naruh. & H. Takano, from Honshu, Japan is described. The plant is believed to be a natural hybrid between Rubus crataegifolius and R. pseudoacer. This hybrid differs from R. crataegifolius by 5-7-palmately lobate to palmately parted leaves, lacerate lobes of leaves, and orbicular petals, from R. pseudoacer by prickles on stems, petioles and nerves on lower surface of leaves, slightly hairy on nerves on lower surface of leaves, and pedicels shorter than 15 mm long.