Origin and Development of the Composites . 267 
5. In Senecio clivorum the filaments are quite unusually 
thick and rigid. 
6. In Senecio grandifolius the male stage is very short and 
the anther tube is frequently split. 
7. Senecio hortensis seems to be a variety of 5. populifolius. 
8. In Senecio populifolius when the anther tube is touched at 
the proper stage the style protrudes quickly as in Gazania, and the 
style branches may be seen to diverge immediately the style is 
exserted and the anthers are retracted sufficiently. 
9. The movement is exceptionally difficult to observe in 
Senecio vulgaris as the proper stage is rare on any one plant, and 
the movement is distinct only during hot weather. 
10. The lateral movement in the Cichoriese is slow, and the 
retraction of the anther tube requires careful observation. It 
frequently continues after the style branches have diverged. 
11. In Lapsana communis the straightening of a single fila¬ 
ment when touched can be observed easily; the other filaments are 
seen to become more bent, thus tilting the anther tube in the 
direction of the stimulated filament. 
12. The critical stage in Taraxacum officinale is short, and 
the movement is shown only when the exsertion of the style is 
beginning. 
13. Dimorphotheca Ecklonis has orange pollen and dark 
purple stamens, the presentation of the pollen is therefore very 
easily seen. 
14. Calendula officinalis and Helipterum roseum are recorded 
by Juel (28) as not irritable, but it must be borne in mind that 
these show the “A’’type only, and that species which are irritable 
in these latitudes may not show the character further north, cp. 
Torenia (Section B, Chap. III). 
15. Ursinia pulchra is very variable, showing “A ” distinctly 
under normal conditions in the north (Newcastle), “ B ” on warm 
days and “ C ” under exceptionally favourable circumstances. U. 
speciosa is also very variable, but the “ C ” type has not yet been 
observed in this species. 
16. For details of the double movement in the stamens and 
the style in Arctotis stoechadifoloia and Gazania splendens see 
Section B, Chap. III). 
17. The anther tube in Achillea mactdonica is frequently split 
by the style. 
18. Achillea Ptarmica usually shows “ A ” distinctly. At 10 
a.m. in the north (Forfarshire) it shows “ C ” slightly, but by noon 
it shows “ C ” distinctly. 
