MAPLE. 
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Plate 51. Alcer saccharum. Sugar Maple. 
1. Branch bearing staminate flowers, one-half natural size. 2. Branch 
bearing pistillate flowers, one-half natural size. 3. I ruiting branch, one- 
half natural size. 4. Staminate flower, enlarged. 5. Longitudinal section 
of staminate tower, enlarged. 6. Pistillate flower, enlarged. 7. Longi- 
tudinal section of pistillate flower, enlarged. 8. Longitudinal section of 
fruit, one-half natural size. 9. Longitudinal section of seed, enlarged. 10. 
Embryo, enlarged. 11. Winter branchlet, one-half natural size. 
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