PLATE III. 



Fig. I. (A) A shoot of Polyaltkia, to illustrate sympodial arrangement. Every 

 stem segment is terminated by a leaf. (B) Monocot} ledonous embryo, 

 to show similar arrangement. (After Worsdell, "A Study of the 

 Vascular System in certain Orders of Ranales," Oct. 1908. "Ann. 

 Bot.,»p. 653.) 



P'ig. 2. Delphinium nudicatile, seedling after eight weeks, to show position of leaf 

 and cotyledon. 



Fig. 3. Delphitiium nudicaule, seedling after fourteen weeks. 



Fig. 4. A = Alisma plant ago \ B, Q,— Corydalis cava; T)=Tainus comnnmis. 

 Mono- and di-cotyledons for comparison to show position of cotyledon. 



(Figs. 2, 3, and 4 after Sarganl, " The Evolution of Monocotyledons.") 



