— 233 — 



after the very valuable system given by A. Peter in Engler & 

 Prantl, Natürl. Pflanzenfam., IV, 5, pp. 375—387, we get the folio- 



wing results of the castration: 





Apogamie 1 ) 



Non-apogamic 



A. 



Subgenus 

 Pilosella 



H. pilosella (Ser. 1 4, III)' 2 ) 

 H. flagellar e (Ser. Ils) 

 H. substoloniflorum (Ser. II 2) 

 H. aurantiacum (Ser. 1, 1-2) 

 H. excellens (Ser. 1 3) 



H. auricula (Ser. VI 3) 



B. 



Subgenus 

 Archieracium 



H. glaucum (Ser. 1 5) 



H. Bornmülleri (Ser. 1 6) 



H. neocerinthe (Ser. 1 7) 



H. sp. (Gerinthoidea) (Ser. 1 8) 



H. longifolium (Ser. 1 9) 



H. silvaticum marginellum(S. I10) 



H. cæsium, forma (Ser. Iii) 



H. hyparcticum (Ser. 1 12) 



H. danicum (Ser. 1 13) 



H. dovrense groenlandicum 



(Ser. 1 14) 

 H. sp., aff. strictum (Ser. 1 15) 

 H. rigidum, forma (Sp. Ii6) 

 H. virosum (VI 7) 

 H. albidum (I17) 



H. umbellatum (Ser. Iis) 



H. umbellatum, filifolium (Ser. 



VI 5) 



H. umbellatum, dunense (Ser. 



vre) 



H. sp., aff. umbellatum (H. lac- 

 taris?) (VI 4) 



C. 



Subgenus 

 Stenotheca 





H. venosum (Ser. VIi) 

 H. Gronovii (Ser. VI 2) 



The table shows, that 1) in the subgenus Pilosella most 

 of the species are apogamic, only E. auricula, belonging to the 

 section Auriculini, needs fertilisation; 2) in the subgenus Archie- 

 racium many species belonging to different groups of the head- 

 sections Aurella and Accipitrina are apogamic, only H. umbellatum 

 sensu latiore is non-apogamic; 3) both the species of the subgenus 

 Stenotheca, used in the experiments, need fertilisation, and probably 

 the other species of this comparatively small subgenus do the same. 



x ) I use the term "apogamy" in the sense, that it comprehends all cases 

 where a plant gives seeds developed from the ovules without fertilisation, 

 whether the eggcell or other cells of the embryosac or a cell from the 

 nucellus are the starting point. 



2 ) The result of Ser. II 4 is uncertain. 



