276 Inheritance in the Groundsel 



Figs. 16, 17, and 18. Various long-styled types. These are very sterile, '\i selfed, but 

 fertile to their own pollen, j'ielding seed quite freely when pollinated artificially with 

 their own pollen or that of neighbouring long- or short-styled capitula. The capitulum 

 represented in Fig. 16 was taken from an ordinai-y plant of genevensis. Fig. 17 illus- 

 trates the type of head alone found in the sickly, hairy, individuals referred to on 

 p. 262, and was taken from an individual of the F^ generation of lanuginosus xpraecox. 

 Fig. 18 was taken from a plant which may almost be described as a non-radiate lanugi- 

 nosus {Fi generation of lanuginosus x multicauHs). 



Fig. 19. MulticauHs Jimbriatus, yellow. 



Fig. 20. Multicatdis JimbriatiDt, cream. 



Both these are apparently ? , the anthers producing no good pollen, hence the difficulty 



in clearing up the mode of inheritance of the fimbriate character. 



Figs. 21, 22, 23, and 24. These figures illustrate the various types of hair development 

 denominated Hq, Hi, H^ and H3 respectively. The portions were carefully selected 

 from young stems at the same phase of development. 21 is from multicauHs ; 22 from 

 the Burry Green groundsel (in 1911 this type had the higher grade of hairiness H2) ; 

 23 is from a very late flowering type (F4 generation of lanuginosus x multicauHs) ; 

 and 24 is from lanuginosus. 



Figs. 25, 26, and 27. Three types of Rr rays produced in the F^ generation of lanugi- 

 nosus X praecox. In the Fi generation there is one type only, that represented in 

 Fig. 26. Compare Fig. 25 with Fig. 11. In such cases as these mistakes would be 

 made unless the influence of the hair factors was considered and allowed for. 



Figs. 28, 29, 30, and 31 (in text, p. 274). 



Fig. 32 (cp. PI. XV). A nearly ripe head oi praecox, radiatus, shewing the revolute ligules 

 of the old withered florets, a condition often erroneously credited to the flowers at the 

 period of pollination. 



University College of South Wales 



and monmouthshiee, cardiff. 



July 22, 1912. 



