24 Annals of the Carnegie Museum. 



-j- B. praecox (J. E. Smith). Scurvy-grass. 



HESPERIS Linnc^us. 



* H. matronalis Linnaeus, Dame's rocket. 



ERYSIMUM Linnsus. 



* E. cheiranthoides LinnKus. Worm-seed mustard. 



SISYMBRIUM Linnaeus. 



* C. officinale (Linnaeus). Hedge-mustard. 



f S. altissimum Linnaeus. Tall hedge- mustard. 



STENOPHRAGMA Celakowsky. 



* S. Thaliana (Linnaeus). Mouse ear cress. 

 Sisymbrium Thalianitm Gay. 



South Fayette Township, dry, stony point, R.R., west of Bridge- 

 ville, June 1 1, 1900. 



lODANTHUS Torrey and Gray. 

 THEL YP ODIUM Endlicher. 



* I. pinnatifidus (Michaux). False rocket. 



Patton Township, Wall's Station, Aug. 24, 1869, Rev. S. W. 

 Knipe ; June 10, 1891, Thomas Seal. 



BRASSICA Linnaeus. 



* B. nigra (Linnaeus). Black mustard. 



f B. arvensis (Linnaeus). Wild mustard. 



* B. campestris Linnaeus. Turnip. 



Frequently persists for several years. 



