(4) 
again. In annuals such spurious species will only 
reappear occasionally. 
Questionable types can be investigated only by 
cultivation. Up to this time California does not 
possess a botanical garden or experimental grounds 
where such questions could be definitely settled. 
Therefore the solution of many problems has been 
left entirely to enthusiasts who utilize their leisure 
hours in the cultivation of doubtful species, fre- 
quently under great difficulties. 
Owing to these circumstances, there is scarcely 
an author writing on our Flora who has not been 
compelled to frequently change or correct his pre- 
vious views, and I hope the present author will be 
excused if in future times investigations shall lead 
him to add to, or to retract, some of his state- 
meuts. 
H. H. BEHR, M. D. 
