

Additions and Corrections. 



The following plants are introduced instead of .native, as indicated 

 in the text ; 



Amaranthus HYBRIDUS L. and forma hypochondriacus L., p. 26. 

 Melilotus OFFICINALIS (L.) Lam., p. 38. 



Insert p. 29, after R. ahortivus L. : 



Ranculatus ahortivus L. var. eucyclus Fernald. Springfield, 

 L. Andrews. 



Insert p. 31, after Alyssum : 



Thlaspi ARVENSE L. Springfield, L. Andrews. 



Insert p. 32, after S. officinale (L.) Scop. var. leiocarpum DC. : 

 Sisymbrium ALTlssiMU'vr L. Springfield, L.Andrews. 



