Further Studies on the Apogamy and Hybridization of the Hieracia. 269 



Urticaceae: [?] Elatostema acutninatiun Brogn. (TREUB, 1905). 

 Elatostefna sessile Forst. (Modilewsk}^ 1908). 

 Menispermaceae:[?] Disciphania Ernstii Eichl. (Ernst, 1886). 

 Ranunculaceae : [?] Tlialictrum Fendleri Englm. (Day, 1896). 



Thalictruiii piirpurascens L. (Overton, 1902). 

 Rosaceae: Alchimilla, sect. Eiialclumilla (Murbeck, 1897, 1901) 



Rosa glauca Vill., subsp. 1 



o ■ ff • A/r + (E. LUNDSTRÖM, 1007). 



Rosa virenhformis Matss. J ^ ' ■> ' ' 



Thymelaeaceae : Wikstroe}nia indica L., Buitenzorg (H. Winkler, 



1904). 



Balanophoraceae : Balanoplwra elongata Bl. (TREUB, 1898). 



Balanoplwra globosa Jungh. (LOTSY, 1899). 



Meiosis giiyanensis Rich. (Chodat and BERNARD, 



1900). 



Compositae: Antennaria alpina (L.) Gärtn. (O. JUEL. 1898, 1900). 



Antennaria fallax Greene 1 (Leavitt and 



Antennaria neodioica Greene J Spalding, 1905). 



Taraxaaiiii, all species examined (Raunkiaer, 



1903)- 



Hieraciuiii, subgen. Pilose IIa \ , ,, 



. , . ,■ ■ nearly all species, 



Hieraaum,suDgen.Arcnteractiii)i] 



(Ostenfeld and Raunkiaer, 1904; Ostenfeld, 



1906). 



It will be seen that the apogamy appears here and there in the 

 families of the phanerogams without relation to their systematic 

 position or affinities; still it is noteworthy that it is so common in 

 the young family of Compositae, which must be supposed to be in its 

 full vigour. There is therefore no reason for setting apogamy in any 

 communication with degeneration. 



The quoted cases of apogamy are not all certain, at least the 

 cytological evidence is still wanting for several of them. Among the 

 uncertain ones is Ficiis, and among the imperfectly examined are 

 Sciaphila, Thismia and the North-American Antennarids. Quite imexa- 

 mined in cytological regard are Disciphania and Thalictrtim Fendleri. 

 These two and Ficiis are omitted in the following considerations. 



Now, if we look at the list, bearing this in mind, we find the 

 peculiarity that not all the species within a genus are apogamic; 

 some are normally sexual. This apphes to all the genera named 

 of Compositae, as ROSENBERG has lately (1909, p. 151) shown that a 



