ON HIERACIUM-HYBRIDS OBTAINED 

 BY ARTIFICIAL FERTILISATION 



By G. Mendel. 



(^Communicated to the Meeting 9 June, 1869*.) 



Although I have already undertaken many experiments 

 in fertilisation between species of Hieracium, I have only 

 succeeded in obtaining the following 6 hybrids, and only 

 from one to three specimens of them : 



U. Auricula $ x H. attrajitianim t 

 H. Auricula %y.H. Pilose I la $ 

 H. Auricula % x H. p7'atense $ 

 H. echioides\ % x H. aurantiacum ^ 

 H. praealtum % x H. flagellare Rchb. Z 

 H. praealtum % x H. aurantiacu7n $ 



The difficulty of obtaining a larger number of hybrids 

 is due to the minuteness of the flowers and their peculiar 

 structure. On account of this circumstance it was seldom 

 possible to remove the anthers from the flowers chosen for 

 fertilisation without either letting pollen get on to the 

 stigma or injuring the pistil so that it withered away. 

 As is well known, the anthers are united to form a tube, 



* [Published in Verh. 7iaturf. Ver. Brimn, Abhandlungen, viii. 1869, 

 p. 26, which appeared in 1870.] 



t The plant used in this experiment is not exactly the typical H. 

 echioides. It appears to belong to the series transitional to H. praealtum, 

 but approaches more nearly to H. echioides and for this reason was 

 reckoned as belonging to the latter. 



