S6 MINNESOTA BOTANICAL STUDIES. 



From the foregoing it may be concluded that broad general- 

 izations in regard to the shape of cotyledons in plant families, 

 cannot be safely made without a considerable mass of data. 



Explanation of Plates. 



Plate I. Seedlings in various stages of the following plants : Popu- 

 lus deltoides^ Ulmus americaua., Celt is occide?ztalis^ Toxylon pomi- 

 ferutn^ Broussoiietia papyrifera^ Liriodendron tztlipifera, But- 

 neria Jlorida^ Parkinsonia aciileata. 



Plate II. Seedlings in various stages of the following plants : Cercis 

 canadensis^ Amorpha fruticosa^ Amorpha 7tana^ Robinia pseudaca- 

 cia^ Ptelea trifoliata^ AilantJms glandulosa^ Sc/ii?zzis molle, Celas- 

 trus scandens. 



Plate III. Seedlings in various stages of the following plants: Acer 

 negundo^ Acez' saccharinzim^ Acer glabrzim^ Berchemia race?nosa^ 

 Rhamnus pzirs/iiazza^ Vitis cordifolia, Parthenocisszis qziinqziefolia^ 

 Sterczilia plantanifolia. 



Plate IV. Seedlings in various stages of the following plants : 

 Elceagnzts zzjnbeUata^ Eucalyptzis globzilzis^ Eucalyptus citriodora^ 

 Cornus aDzomzim., JSIohrodezzdrotz carolinzim^ Catalpa speciosa, Te- 

 coma radica?zs^ CepJzalanthzis occide7ztalis^ Sambuczis pubeizs. 



The amount of enlargement or reduction is indicated for each plant. 



