BIRCH. 279 
Plate 27. Betula luica. Yellow Birch. 
1. Flowering branch, one-half natural size. 2. Staminate flower, en- 
larged. 3. Vuistillate flower, enlarged. 4. Fruiting branch, one-half nat- 
ural size. 5. Nut, enlarged. 6. Scale of iruiting catkin, enlarged. 7. Win- 
ver branch, showing staminate catkin, one-half natural size. 
