IOWA ACADEMY OF SCIENCE Vol. XXV, 191S 

 Fier. S9 



Fig. 90 

 Fig. 89. — ^Serrations of leaf margin of Primus padus seedling 

 glandular tips. Drawn by C. M. King. 



Fig. 90. — Seedling of Prunus padus. Drawn by C. M. King. 



Fig. 92 



showing 



P^ig. 91 Fig. 93 



Fig. 91. — Prunus cerasus, seedling; a, early germination. Drawn by C. 

 M. King. 



Fig. 92. — Margin of young seedling leaf of Prunus serotina, showing 

 glandular tips of serrations. Drawn by C. M. King. 



Fig. 93. — 1. Trichomes of Gleditsia triacanthos ; 2, a short hair at greater 

 magnification. Drawn by C. M. King. 



