26 



Moist allnvlal ground seems specially adapted to this 

 species, which In such locations may become surprisingly 

 abundant and rigorous. 

 Diagnosis and variation: 



Conspicuous recognition characters are the lyrate» 

 finely dentate lower stem-leaves > the entire and almost 

 linear leaves of the inflorescence » and the short » very 

 small -beakt capsules. Sheet 9 has a specimen '(from 

 Alumni Field) lacking In fine leaf -dentation; tho this 

 character seems rather variable. It Is doubtful whether 

 this plant may not be B. Juncea. One specimen found 

 near Renwlck Is very probably B . Juncea (which see), as 

 It has capsules much larger and longer-beakt than Is usual 

 for B. nigra , with leaf -margins much like those shown 

 for B. Juncea by B. & B. 



13. Brasslca dleracea L. 



Scientific name; as above; history not given by 



a. 

 B. & B. Common names: cabbage, eullf lower, etc. Sev- 



eral of these forms are ao distinct that the writer can 



(aside fTo-m trKe foTmal rule of tke CodeO 

 see no good reason^ for refusing them the rank of species-i- 



unless they intercross readily, and natural Intercrossing 

 of species 

 is of course by no means unknown in some of the genera 



A 



