River Birch, Dura Heat SS 4"-5" B&BDura Heat River BirchBetula nigra 'BNMTF'A more heat and drought tolerant form of this species, with superior insect and disease resistance. The pyramidal form features dense, glossy green leaves that fade to clear butter yellow in fall, and striking winter bark that is a pinkish orange with prominent exfoliation. This large tree is excellent for use as a focal point or shade tree. Deciduous.