32 
James Small. 
development. Yellow is absent from the Barnadesiinae, but the 
presence of orange in Schlechtendahlia confirms the primitive 
position as in Fig, 7, Chap. II. 
Veruoniece —Purple is predominant, with white, pink and red 
occasional, and yellow absent except for a greenish yellow in some 
species of Corymbium in the Vernoniinae. 
Asterece —Yellow is again predominant in both ray and disc, 
especially in the latter. The chief point to he noted is the complete 
predominance of yellow in the Homochrominae as contrasting with 
the development of a wide range of colours up to blue in the rays 
of the Heterochrominae. These higher colours sometimes invade 
the disc, so that the relative position, as in Fig. 7, of these two 
sub-tribes requires to be reversed. A study of Tables VI and VII, 
Chap. II, shows that this can he done without inconsistency as the 
structure of the pollen-presentation mechanism in these two 
groups is very similar. The higher development of irritability 
(Chap. Ill, Sect. E) in the Heterochrominae is also explained by 
this change. As yellow is predominant in the Conyzinae and 
Baccharidinae these would retain their positions as coming from 
the lower of the two main groups, while the Grangeinae with 
purple and violet sometimes in the disc and yellow not predom¬ 
inant would retain its position as coming from the higher plexus. The 
Bellidinse with yellow as a constant disc colour and white, or rarely 
blue or purple, in the ray would remain near the base of the tribe, 
as a side group with its present development between the main 
groups. 
Eupatoriece —Purple is predominant with white common. 
Yellow occurs only rarely in Mikania, which with Ejipatonum, 
forms the basal group in the Ageratinae. Pink and blue also 
occur in a few genera. 
Helianthece —Yellow is predominant in both ray and disc 
especially in the latter. All the higher colours except blue appear 
occasionally, white being comparatively common in the ray, but the 
variation is so extensive that the position of the sub-tribes cannot 
be distinguished. 
Heleniece —Yellow is again predominant but orange is frequent. 
White and purple occur but rarely in the Tagetinae, less rarely in 
the Heleniinae and Baeriinae. Yellow is the only colour in the 
Flaveriinae and Jaumeinae, so that the position of the former is 
confirmed and that of the latter above the Baeriinae is rendered 
