黑桦 Betula duyurica
黑桦 Betula duvurica
坚桦 Betula chinensis
坚桦 Betula chinensis
Betula nigra
Betula nigra
Betula pendula-Native, from Berlin-Germany(branch in flower) lO Thomas Schoepke
Betula pendula -Native, from Berlin-Germany (branch in flower)
Betula pendula roTh. tHomas Schoepke