Zi EN 
after the very valuable system given by A. Peter in Engler & 
Prantl, Natürl. Pflanzenfam., IV, 5, pp. 375—387, we get the follo- 
wing results of the castration: 
— —$— m en 
Apogamie!) Non-apogamic 
A. 
Subgenus H: pilosella (Ser. 14, IT1)”) H. auricula (Ser. V13) 
Pilosella HA. flagellare (Ser. IL3) 
H. substoloniflorum (Ser. IL2) 
H. aurantiacum (Ser. I, 1-2) 
H. excellens (Ser. [3) 
Subgenus H. glaucum (Ser. 15) H. umbellatum (Ser. 118) 
Archieracium | H. Bornmülleri (Ser. I6) H. umbellatum, filifolium (Ser. 
H. neocerinthe (Ser. 17) VI5) 
H. sp. (Cerinthoidea) (Ser.1s) H. umbellatum, dunense (Ser. 
H. longifolium (Ser. 19) VI6) 
H. silvaticum marginellum(S. [10)| H. sp., aff. umbellatum (H. lac- 
H. cesium, forma (Ser. I 11) taris ?) (VI4) 
H. hyparcticum (Ser. 112) 
H. danicum (Ser. 113) 
H. dovrense groenlandicum 
(Ser. Iı4) 
H. sp., aff. strictum (Ser. 115) 
H. rigidum, forma (Sp. [16) 
| H. virosum (VI7) 
H. albidum (117) 
C. 
Subgenus H. venosum (Ser. VI1) 
Stenotheca H. Gronovii (Ser. VI2) 
The table shows, that 1) in the subgenus Pilosella most 
of the species are apogamic, only A. auricula, belonging to the 
section Auriculini, needs fertilisation; 2) in the subgenus Archie- 
racium many species belonging to different groups of the head- 
sections Awrella and Accipitrina are apogamic, only H. wmbellatum 
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. 
1) 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. 
*) The result of Ser. Il, is uncertain. 
