20 



THE AMERICAN NATURALIST 



[Vol. XLII 



spieuous of those extraordinary habits which members 

 of the various groups possess and which have become con- 

 stant and hereditary will be shown. Many of those habits 

 are of wonderful character, and one almost feels that he 

 is dealing with sentient beings of great cunning and law- 

 lessness rather than with vegetal forms. 



The phenogamous parasites are so aberrant as regards 

 both their structural and vital relations to other plants 

 and to one another that it is difficult to classify them. 

 Indeed, there is no logically recognizable correlation of 

 any of the parasitic characters of the species in question 

 with those which pertain to systematic classification. The 

 following synopsis, prepared for the present occasion 

 only, embraces seven groups the characterization of which 

 is, so far as practicable, based upon the manner of para- 

 sitism of the members of the 

 respective groups and upon 

 the peculiarities of their 

 life history, especially that 



wlm 



Seeds germinate upon the 

 ground. Embryo differenti- 

 ated into cotyledons, radicle 

 and plumule, like normal em- 

 bryos. Like normal plants 



those i 

 > chlo 



pi.vl. 



group 

 A 



.art 



tial. Examples: Euphrasia, Pedicularis, Castillo ja i 

 many others. 



The parasitism of the members of group I, which 



