HORNBEAM. 283 
Plate 20. Ostrya virginiana. Tlornbeam. 
1. Flowering branch, one-half natural size. 2. Scale of staminate cat- 
kin, enlarged. 3. Stamen, enlarged. 4. Diagram of pistillate inflorescence. 
5. Scale of pistillate catkin, enlarged. 6. Vistillate lower enclosed in bract 
and bractlets, enlarged. 7. Fruiting branch, one-half natural size. $8. Lon- 
gitudinal section of truiting involucre, showing nut, one-half natural size. 
9g. Longitudinal section of nut, natural size. 
