ERRATA. 



Page 49, fourteenth line from top, for " tomentosa " read " tomentella." 



96, thirteenth and fourteenth lines from bottom, for " striata " read 

 " arvensis. " 



99, fourth line from top, for " tomentulosa " read ' leucoph3'lla." 



154, eighth line from bottom, for '" limosa" read "aquatilis." 



21 s, twelfth line from bottom, for " pulegioides " read " Pulegium." 



335 and 335, for " Piaus contorta " read " P. Murrayana." 



33S, twenty-third line, for Negundo " Californica " read " N. Cali- 

 fornicum. " 



33S, twenty-ninth dele Negundo Califoruicum. 



