Lyrate-crenate leaf of the 

 White Mustard {Sina/is 

 alba), p. 30. 



Shepherd's Purse {Capsella bursa pastoris). 

 p. 26. 



Cotyledons of Cruciferae. a, conduplicate ; b, accumbent ; 

 Cf incumbent, p. 24. 



{.Opposite p. 24, 



