— 280 — 



The results of these examinations might Be summed up briefly 

 as follows: 



P. fiuitans auct. consists of two quite different plants viz., an 

 independent species belonging to the P. polygonifolius-group, and 

 a plant of hybrid origin viz. P. lucens x natans. As we ought 

 not to increase the number of names more than absolutely neces- 

 sary, the name of P. fiuitans should be kept for the one form, 

 namely the Neckar-plant, partly because the bastard as a bastard 

 cannot claim an independent name that is due to the independent 

 species — and partly because the hitherto known original specimens 

 of Roth's P. fiuitans all belong to the Neckar-plant, which 

 for the future ought only to bear the name of P. fiuitans Roth. 



