New Localities of Betula costata (Betulaceae) from Nagano Prefecture, Japan

Abstract

Betula costata Trautv. (Betulaceae) is widely distributed in continental Northeastern Asia and also disjunctly distributed in Japan. However, there have been few reports on the distribution of this species in Japan, and previously no photograph of this species has been presented from Japan. In this study, we report four new locations of B. costata in Nagano Prefecture, Japan. We also provided the photographs for the first time.