I.] 



SCROPHULARIACE.E. 



193 



A partial parasitism occurs in some species allied to 

 the Rattle (Rhinanthus) and Eyebright {Eupkrasia\ as 



may be ascertained by carefully washing away the soil 

 from the roots. When raised from seed, apart from the 

 plants upon which they prey, though capable of germina- 

 tion they do not grow more than an inch or so in height 



FIG. 130. Vertical section 

 of flower of Common 

 Toadflax, showing the 

 spur. The corolla is per- 

 sonate. 



FIG. 131. Monstrosity (Peloria) of Com- 

 mon Toadflax, in which 5 spurs are de- 

 veloped, so that the corolla is regular. 



and produce but one or two flowers. It is not precisely 

 ascertained what amount or kind of nourishment the 

 nurse-plants yield. Cow-wheat (Melampyrut*\ Eye- 

 bright, Bartsia, and Rattle are suited to experiment 

 upon with a view to further information. 



The Family includes very few useful plants, though 

 many are highly ornamental and common in cultivation, 

 as Calceolaria, Pentstemon, Snapdragon, Monkey-flower 

 and Musk (Mimulus\ Speedwells, &c. Foxglove is very 

 poisonous, and is used in medicine ; a yellow dye is 



O. B. O 



