254 



TREES OF MINNESOTA. 



Plate 



Tilia americana. Basswocd. 



i. Flowering branch, one-half natural size. 2. Diagram of flower. 3. 

 A flower with two sepals and two petals removed. 4. A cluster of stamens 

 with their petalpid scale, enlarged. 5. A stamen, enlarged. 6. Pistil, 

 showing longitudinal section of ovary, enlarged. 7. Cross section of ovary, 

 enlarged. 8. Cluster of fruit separated from bract. 9. Cross section of 

 fruit. 10. Embryo, showing s-lobed cotyledons. 





